1 /*
2 * OpenVPN -- An application to securely tunnel IP networks
3 * over a single TCP/UDP port, with support for SSL/TLS-based
4 * session authentication and key exchange,
5 * packet encryption, packet authentication, and
6 * packet compression.
7 *
8 * Copyright (C) 2002-2018 OpenVPN Inc <sales@openvpn.net>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2
12 * as published by the Free Software Foundation.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
22 */
23
24 /*
25 * Support routines for adding/deleting network routes.
26 */
27
28 #ifdef HAVE_CONFIG_H
29 #include "config.h"
30 #elif defined(_MSC_VER)
31 #include "config-msvc.h"
32 #endif
33
34 #include "syshead.h"
35
36 #include "common.h"
37 #include "error.h"
38 #include "route.h"
39 #include "run_command.h"
40 #include "socket.h"
41 #include "manage.h"
42 #include "win32.h"
43 #include "options.h"
44 #include "networking.h"
45
46 #include "memdbg.h"
47
48 #if defined(TARGET_LINUX) || defined(TARGET_ANDROID)
49 #include <linux/rtnetlink.h> /* RTM_GETROUTE etc. */
50 #endif
51
52 #if defined(TARGET_NETBSD)
53 #include <net/route.h> /* RT_ROUNDUP(), RT_ADVANCE() */
54 #endif
55
56 #ifdef _WIN32
57 #include "openvpn-msg.h"
58
59 #define METRIC_NOT_USED ((DWORD)-1)
60 static bool add_route_service(const struct route_ipv4 *, const struct tuntap *);
61
62 static bool del_route_service(const struct route_ipv4 *, const struct tuntap *);
63
64 static bool add_route_ipv6_service(const struct route_ipv6 *, const struct tuntap *);
65
66 static bool del_route_ipv6_service(const struct route_ipv6 *, const struct tuntap *);
67
68 #endif
69
70 static void delete_route(struct route_ipv4 *r, const struct tuntap *tt, unsigned int flags, const struct route_gateway_info *rgi, const struct env_set *es, openvpn_net_ctx_t *ctx);
71
72 static void get_bypass_addresses(struct route_bypass *rb, const unsigned int flags);
73
74 #ifdef ENABLE_DEBUG
75
76 static void
print_bypass_addresses(const struct route_bypass * rb)77 print_bypass_addresses(const struct route_bypass *rb)
78 {
79 struct gc_arena gc = gc_new();
80 int i;
81 for (i = 0; i < rb->n_bypass; ++i)
82 {
83 msg(D_ROUTE, "ROUTE: bypass_host_route[%d]=%s",
84 i,
85 print_in_addr_t(rb->bypass[i], 0, &gc));
86 }
87 gc_free(&gc);
88 }
89
90 #endif
91
92 static bool
add_bypass_address(struct route_bypass * rb,const in_addr_t a)93 add_bypass_address(struct route_bypass *rb, const in_addr_t a)
94 {
95 int i;
96 for (i = 0; i < rb->n_bypass; ++i)
97 {
98 if (a == rb->bypass[i]) /* avoid duplicates */
99 {
100 return true;
101 }
102 }
103 if (rb->n_bypass < N_ROUTE_BYPASS)
104 {
105 rb->bypass[rb->n_bypass++] = a;
106 return true;
107 }
108 else
109 {
110 return false;
111 }
112 }
113
114 struct route_option_list *
new_route_option_list(struct gc_arena * a)115 new_route_option_list(struct gc_arena *a)
116 {
117 struct route_option_list *ret;
118 ALLOC_OBJ_CLEAR_GC(ret, struct route_option_list, a);
119 ret->gc = a;
120 return ret;
121 }
122
123 struct route_ipv6_option_list *
new_route_ipv6_option_list(struct gc_arena * a)124 new_route_ipv6_option_list(struct gc_arena *a)
125 {
126 struct route_ipv6_option_list *ret;
127 ALLOC_OBJ_CLEAR_GC(ret, struct route_ipv6_option_list, a);
128 ret->gc = a;
129 return ret;
130 }
131
132 /*
133 * NOTE: structs are cloned/copied shallow by design.
134 * The routes list from src will stay intact since it is allocated using
135 * the options->gc. The cloned/copied lists will share this common tail
136 * to avoid copying the data around between pulls. Pulled routes use
137 * the c2->gc so they get freed immediately after a reconnect.
138 */
139 struct route_option_list *
clone_route_option_list(const struct route_option_list * src,struct gc_arena * a)140 clone_route_option_list(const struct route_option_list *src, struct gc_arena *a)
141 {
142 struct route_option_list *ret;
143 ALLOC_OBJ_GC(ret, struct route_option_list, a);
144 *ret = *src;
145 return ret;
146 }
147
148 struct route_ipv6_option_list *
clone_route_ipv6_option_list(const struct route_ipv6_option_list * src,struct gc_arena * a)149 clone_route_ipv6_option_list(const struct route_ipv6_option_list *src, struct gc_arena *a)
150 {
151 struct route_ipv6_option_list *ret;
152 ALLOC_OBJ_GC(ret, struct route_ipv6_option_list, a);
153 *ret = *src;
154 return ret;
155 }
156
157 void
copy_route_option_list(struct route_option_list * dest,const struct route_option_list * src,struct gc_arena * a)158 copy_route_option_list(struct route_option_list *dest, const struct route_option_list *src, struct gc_arena *a)
159 {
160 *dest = *src;
161 dest->gc = a;
162 }
163
164 void
copy_route_ipv6_option_list(struct route_ipv6_option_list * dest,const struct route_ipv6_option_list * src,struct gc_arena * a)165 copy_route_ipv6_option_list(struct route_ipv6_option_list *dest,
166 const struct route_ipv6_option_list *src,
167 struct gc_arena *a)
168 {
169 *dest = *src;
170 dest->gc = a;
171 }
172
173 static const char *
route_string(const struct route_ipv4 * r,struct gc_arena * gc)174 route_string(const struct route_ipv4 *r, struct gc_arena *gc)
175 {
176 struct buffer out = alloc_buf_gc(256, gc);
177 buf_printf(&out, "ROUTE network %s netmask %s gateway %s",
178 print_in_addr_t(r->network, 0, gc),
179 print_in_addr_t(r->netmask, 0, gc),
180 print_in_addr_t(r->gateway, 0, gc)
181 );
182 if (r->flags & RT_METRIC_DEFINED)
183 {
184 buf_printf(&out, " metric %d", r->metric);
185 }
186 return BSTR(&out);
187 }
188
189 static bool
is_route_parm_defined(const char * parm)190 is_route_parm_defined(const char *parm)
191 {
192 if (!parm)
193 {
194 return false;
195 }
196 if (!strcmp(parm, "default"))
197 {
198 return false;
199 }
200 return true;
201 }
202
203 static void
setenv_route_addr(struct env_set * es,const char * key,const in_addr_t addr,int i)204 setenv_route_addr(struct env_set *es, const char *key, const in_addr_t addr, int i)
205 {
206 struct gc_arena gc = gc_new();
207 struct buffer name = alloc_buf_gc(256, &gc);
208 if (i >= 0)
209 {
210 buf_printf(&name, "route_%s_%d", key, i);
211 }
212 else
213 {
214 buf_printf(&name, "route_%s", key);
215 }
216 setenv_str(es, BSTR(&name), print_in_addr_t(addr, 0, &gc));
217 gc_free(&gc);
218 }
219
220 static bool
get_special_addr(const struct route_list * rl,const char * string,in_addr_t * out,bool * status)221 get_special_addr(const struct route_list *rl,
222 const char *string,
223 in_addr_t *out,
224 bool *status)
225 {
226 if (status)
227 {
228 *status = true;
229 }
230 if (!strcmp(string, "vpn_gateway"))
231 {
232 if (rl)
233 {
234 if (rl->spec.flags & RTSA_REMOTE_ENDPOINT)
235 {
236 *out = rl->spec.remote_endpoint;
237 }
238 else
239 {
240 msg(M_INFO, PACKAGE_NAME " ROUTE: vpn_gateway undefined");
241 if (status)
242 {
243 *status = false;
244 }
245 }
246 }
247 return true;
248 }
249 else if (!strcmp(string, "net_gateway"))
250 {
251 if (rl)
252 {
253 if (rl->rgi.flags & RGI_ADDR_DEFINED)
254 {
255 *out = rl->rgi.gateway.addr;
256 }
257 else
258 {
259 msg(M_INFO, PACKAGE_NAME " ROUTE: net_gateway undefined -- unable to get default gateway from system");
260 if (status)
261 {
262 *status = false;
263 }
264 }
265 }
266 return true;
267 }
268 else if (!strcmp(string, "remote_host"))
269 {
270 if (rl)
271 {
272 if (rl->spec.flags & RTSA_REMOTE_HOST)
273 {
274 *out = rl->spec.remote_host;
275 }
276 else
277 {
278 msg(M_INFO, PACKAGE_NAME " ROUTE: remote_host undefined");
279 if (status)
280 {
281 *status = false;
282 }
283 }
284 }
285 return true;
286 }
287 return false;
288 }
289
290 bool
is_special_addr(const char * addr_str)291 is_special_addr(const char *addr_str)
292 {
293 if (addr_str)
294 {
295 return get_special_addr(NULL, addr_str, NULL, NULL);
296 }
297 else
298 {
299 return false;
300 }
301 }
302
303 static bool
init_route(struct route_ipv4 * r,struct addrinfo ** network_list,const struct route_option * ro,const struct route_list * rl)304 init_route(struct route_ipv4 *r,
305 struct addrinfo **network_list,
306 const struct route_option *ro,
307 const struct route_list *rl)
308 {
309 const in_addr_t default_netmask = IPV4_NETMASK_HOST;
310 bool status;
311 int ret;
312 struct in_addr special;
313
314 CLEAR(*r);
315 r->option = ro;
316
317 /* network */
318
319 if (!is_route_parm_defined(ro->network))
320 {
321 goto fail;
322 }
323
324
325 /* get_special_addr replaces specialaddr with a special ip addr
326 * like gw. getaddrinfo is called to convert a a addrinfo struct */
327
328 if (get_special_addr(rl, ro->network, (in_addr_t *) &special.s_addr, &status))
329 {
330 if (!status)
331 {
332 goto fail;
333 }
334 special.s_addr = htonl(special.s_addr);
335 ret = openvpn_getaddrinfo(0, inet_ntoa(special), NULL, 0, NULL,
336 AF_INET, network_list);
337 }
338 else
339 {
340 ret = openvpn_getaddrinfo(GETADDR_RESOLVE | GETADDR_WARN_ON_SIGNAL,
341 ro->network, NULL, 0, NULL, AF_INET, network_list);
342 }
343
344 status = (ret == 0);
345
346 if (!status)
347 {
348 goto fail;
349 }
350
351 /* netmask */
352
353 if (is_route_parm_defined(ro->netmask))
354 {
355 r->netmask = getaddr(
356 GETADDR_HOST_ORDER
357 | GETADDR_WARN_ON_SIGNAL,
358 ro->netmask,
359 0,
360 &status,
361 NULL);
362 if (!status)
363 {
364 goto fail;
365 }
366 }
367 else
368 {
369 r->netmask = default_netmask;
370 }
371
372 /* gateway */
373
374 if (is_route_parm_defined(ro->gateway))
375 {
376 if (!get_special_addr(rl, ro->gateway, &r->gateway, &status))
377 {
378 r->gateway = getaddr(
379 GETADDR_RESOLVE
380 | GETADDR_HOST_ORDER
381 | GETADDR_WARN_ON_SIGNAL,
382 ro->gateway,
383 0,
384 &status,
385 NULL);
386 }
387 if (!status)
388 {
389 goto fail;
390 }
391 }
392 else
393 {
394 if (rl->spec.flags & RTSA_REMOTE_ENDPOINT)
395 {
396 r->gateway = rl->spec.remote_endpoint;
397 }
398 else
399 {
400 msg(M_WARN, PACKAGE_NAME " ROUTE: " PACKAGE_NAME " needs a gateway parameter for a --route option and no default was specified by either --route-gateway or --ifconfig options");
401 goto fail;
402 }
403 }
404
405 /* metric */
406
407 r->metric = 0;
408 if (is_route_parm_defined(ro->metric))
409 {
410 r->metric = atoi(ro->metric);
411 if (r->metric < 0)
412 {
413 msg(M_WARN, PACKAGE_NAME " ROUTE: route metric for network %s (%s) must be >= 0",
414 ro->network,
415 ro->metric);
416 goto fail;
417 }
418 r->flags |= RT_METRIC_DEFINED;
419 }
420 else if (rl->spec.flags & RTSA_DEFAULT_METRIC)
421 {
422 r->metric = rl->spec.default_metric;
423 r->flags |= RT_METRIC_DEFINED;
424 }
425
426 r->flags |= RT_DEFINED;
427
428 return true;
429
430 fail:
431 msg(M_WARN, PACKAGE_NAME " ROUTE: failed to parse/resolve route for host/network: %s",
432 ro->network);
433 return false;
434 }
435
436 static bool
init_route_ipv6(struct route_ipv6 * r6,const struct route_ipv6_option * r6o,const struct route_ipv6_list * rl6)437 init_route_ipv6(struct route_ipv6 *r6,
438 const struct route_ipv6_option *r6o,
439 const struct route_ipv6_list *rl6 )
440 {
441 CLEAR(*r6);
442
443 if (!get_ipv6_addr( r6o->prefix, &r6->network, &r6->netbits, M_WARN ))
444 {
445 goto fail;
446 }
447
448 /* gateway */
449 if (is_route_parm_defined(r6o->gateway))
450 {
451 if (inet_pton( AF_INET6, r6o->gateway, &r6->gateway ) != 1)
452 {
453 msg( M_WARN, PACKAGE_NAME "ROUTE6: cannot parse gateway spec '%s'", r6o->gateway );
454 }
455 }
456 else if (rl6->spec_flags & RTSA_REMOTE_ENDPOINT)
457 {
458 r6->gateway = rl6->remote_endpoint_ipv6;
459 }
460
461 /* metric */
462
463 r6->metric = -1;
464 if (is_route_parm_defined(r6o->metric))
465 {
466 r6->metric = atoi(r6o->metric);
467 if (r6->metric < 0)
468 {
469 msg(M_WARN, PACKAGE_NAME " ROUTE: route metric for network %s (%s) must be >= 0",
470 r6o->prefix,
471 r6o->metric);
472 goto fail;
473 }
474 r6->flags |= RT_METRIC_DEFINED;
475 }
476 else if (rl6->spec_flags & RTSA_DEFAULT_METRIC)
477 {
478 r6->metric = rl6->default_metric;
479 r6->flags |= RT_METRIC_DEFINED;
480 }
481
482 r6->flags |= RT_DEFINED;
483
484 return true;
485
486 fail:
487 msg(M_WARN, PACKAGE_NAME " ROUTE: failed to parse/resolve route for host/network: %s",
488 r6o->prefix);
489 return false;
490 }
491
492 void
add_route_to_option_list(struct route_option_list * l,const char * network,const char * netmask,const char * gateway,const char * metric)493 add_route_to_option_list(struct route_option_list *l,
494 const char *network,
495 const char *netmask,
496 const char *gateway,
497 const char *metric)
498 {
499 struct route_option *ro;
500 ALLOC_OBJ_GC(ro, struct route_option, l->gc);
501 ro->network = network;
502 ro->netmask = netmask;
503 ro->gateway = gateway;
504 ro->metric = metric;
505 ro->next = l->routes;
506 l->routes = ro;
507
508 }
509
510 void
add_route_ipv6_to_option_list(struct route_ipv6_option_list * l,const char * prefix,const char * gateway,const char * metric)511 add_route_ipv6_to_option_list(struct route_ipv6_option_list *l,
512 const char *prefix,
513 const char *gateway,
514 const char *metric)
515 {
516 struct route_ipv6_option *ro;
517 ALLOC_OBJ_GC(ro, struct route_ipv6_option, l->gc);
518 ro->prefix = prefix;
519 ro->gateway = gateway;
520 ro->metric = metric;
521 ro->next = l->routes_ipv6;
522 l->routes_ipv6 = ro;
523 }
524
525 static void
clear_route_list(struct route_list * rl)526 clear_route_list(struct route_list *rl)
527 {
528 gc_free(&rl->gc);
529 CLEAR(*rl);
530 }
531
532 static void
clear_route_ipv6_list(struct route_ipv6_list * rl6)533 clear_route_ipv6_list(struct route_ipv6_list *rl6)
534 {
535 gc_free(&rl6->gc);
536 CLEAR(*rl6);
537 }
538
539 void
route_list_add_vpn_gateway(struct route_list * rl,struct env_set * es,const in_addr_t addr)540 route_list_add_vpn_gateway(struct route_list *rl,
541 struct env_set *es,
542 const in_addr_t addr)
543 {
544 ASSERT(rl);
545 rl->spec.remote_endpoint = addr;
546 rl->spec.flags |= RTSA_REMOTE_ENDPOINT;
547 setenv_route_addr(es, "vpn_gateway", rl->spec.remote_endpoint, -1);
548 }
549
550 static void
add_block_local_item(struct route_list * rl,const struct route_gateway_address * gateway,in_addr_t target)551 add_block_local_item(struct route_list *rl,
552 const struct route_gateway_address *gateway,
553 in_addr_t target)
554 {
555 const int rgi_needed = (RGI_ADDR_DEFINED|RGI_NETMASK_DEFINED);
556 if ((rl->rgi.flags & rgi_needed) == rgi_needed
557 && rl->rgi.gateway.netmask < 0xFFFFFFFF)
558 {
559 struct route_ipv4 *r1, *r2;
560 unsigned int l2;
561
562 ALLOC_OBJ_GC(r1, struct route_ipv4, &rl->gc);
563 ALLOC_OBJ_GC(r2, struct route_ipv4, &rl->gc);
564
565 /* split a route into two smaller blocking routes, and direct them to target */
566 l2 = ((~gateway->netmask)+1)>>1;
567 r1->flags = RT_DEFINED;
568 r1->gateway = target;
569 r1->network = gateway->addr & gateway->netmask;
570 r1->netmask = ~(l2-1);
571 r1->next = rl->routes;
572 rl->routes = r1;
573
574 *r2 = *r1;
575 r2->network += l2;
576 r2->next = rl->routes;
577 rl->routes = r2;
578 }
579 }
580
581 static void
add_block_local(struct route_list * rl)582 add_block_local(struct route_list *rl)
583 {
584 const int rgi_needed = (RGI_ADDR_DEFINED|RGI_NETMASK_DEFINED);
585 if ((rl->flags & RG_BLOCK_LOCAL)
586 && (rl->rgi.flags & rgi_needed) == rgi_needed
587 && (rl->spec.flags & RTSA_REMOTE_ENDPOINT)
588 && rl->spec.remote_host_local != TLA_LOCAL)
589 {
590 size_t i;
591
592 #ifndef TARGET_ANDROID
593 /* add bypass for gateway addr */
594 add_bypass_address(&rl->spec.bypass, rl->rgi.gateway.addr);
595 #endif
596
597 /* block access to local subnet */
598 add_block_local_item(rl, &rl->rgi.gateway, rl->spec.remote_endpoint);
599
600 /* process additional subnets on gateway interface */
601 for (i = 0; i < rl->rgi.n_addrs; ++i)
602 {
603 const struct route_gateway_address *gwa = &rl->rgi.addrs[i];
604 /* omit the add/subnet in &rl->rgi which we processed above */
605 if (!((rl->rgi.gateway.addr & rl->rgi.gateway.netmask) == (gwa->addr & gwa->netmask)
606 && rl->rgi.gateway.netmask == gwa->netmask))
607 {
608 add_block_local_item(rl, gwa, rl->spec.remote_endpoint);
609 }
610 }
611 }
612 }
613
614 bool
init_route_list(struct route_list * rl,const struct route_option_list * opt,const char * remote_endpoint,int default_metric,in_addr_t remote_host,struct env_set * es,openvpn_net_ctx_t * ctx)615 init_route_list(struct route_list *rl,
616 const struct route_option_list *opt,
617 const char *remote_endpoint,
618 int default_metric,
619 in_addr_t remote_host,
620 struct env_set *es,
621 openvpn_net_ctx_t *ctx)
622 {
623 struct gc_arena gc = gc_new();
624 bool ret = true;
625
626 clear_route_list(rl);
627
628 rl->flags = opt->flags;
629
630 if (remote_host != IPV4_INVALID_ADDR)
631 {
632 rl->spec.remote_host = remote_host;
633 rl->spec.flags |= RTSA_REMOTE_HOST;
634 }
635
636 if (default_metric)
637 {
638 rl->spec.default_metric = default_metric;
639 rl->spec.flags |= RTSA_DEFAULT_METRIC;
640 }
641
642 get_default_gateway(&rl->rgi, ctx);
643 if (rl->rgi.flags & RGI_ADDR_DEFINED)
644 {
645 setenv_route_addr(es, "net_gateway", rl->rgi.gateway.addr, -1);
646 #if defined(ENABLE_DEBUG) && !defined(ENABLE_SMALL)
647 print_default_gateway(D_ROUTE, &rl->rgi, NULL);
648 #endif
649 }
650 else
651 {
652 dmsg(D_ROUTE, "ROUTE: default_gateway=UNDEF");
653 }
654
655 if (rl->spec.flags & RTSA_REMOTE_HOST)
656 {
657 rl->spec.remote_host_local = test_local_addr(remote_host, &rl->rgi);
658 }
659
660 if (is_route_parm_defined(remote_endpoint))
661 {
662 bool defined = false;
663 rl->spec.remote_endpoint = getaddr(
664 GETADDR_RESOLVE
665 | GETADDR_HOST_ORDER
666 | GETADDR_WARN_ON_SIGNAL,
667 remote_endpoint,
668 0,
669 &defined,
670 NULL);
671
672 if (defined)
673 {
674 setenv_route_addr(es, "vpn_gateway", rl->spec.remote_endpoint, -1);
675 rl->spec.flags |= RTSA_REMOTE_ENDPOINT;
676 }
677 else
678 {
679 msg(M_WARN, PACKAGE_NAME " ROUTE: failed to parse/resolve default gateway: %s",
680 remote_endpoint);
681 ret = false;
682 }
683 }
684
685 if (rl->flags & RG_ENABLE)
686 {
687 add_block_local(rl);
688 get_bypass_addresses(&rl->spec.bypass, rl->flags);
689 #ifdef ENABLE_DEBUG
690 print_bypass_addresses(&rl->spec.bypass);
691 #endif
692 }
693
694 /* parse the routes from opt to rl */
695 {
696 struct route_option *ro;
697 for (ro = opt->routes; ro; ro = ro->next)
698 {
699 struct addrinfo *netlist = NULL;
700 struct route_ipv4 r;
701
702 if (!init_route(&r, &netlist, ro, rl))
703 {
704 ret = false;
705 }
706 else
707 {
708 struct addrinfo *curele;
709 for (curele = netlist; curele; curele = curele->ai_next)
710 {
711 struct route_ipv4 *new;
712 ALLOC_OBJ_GC(new, struct route_ipv4, &rl->gc);
713 *new = r;
714 new->network = ntohl(((struct sockaddr_in *)curele->ai_addr)->sin_addr.s_addr);
715 new->next = rl->routes;
716 rl->routes = new;
717 }
718 }
719 if (netlist)
720 {
721 gc_addspecial(netlist, &gc_freeaddrinfo_callback, &gc);
722 }
723 }
724 }
725
726 gc_free(&gc);
727 return ret;
728 }
729
730 /* check whether an IPv6 host address is covered by a given route_ipv6
731 * (not the most beautiful implementation in the world, but portable and
732 * "good enough")
733 */
734 static bool
route_ipv6_match_host(const struct route_ipv6 * r6,const struct in6_addr * host)735 route_ipv6_match_host( const struct route_ipv6 *r6,
736 const struct in6_addr *host )
737 {
738 unsigned int bits = r6->netbits;
739 int i;
740 unsigned int mask;
741
742 if (bits>128)
743 {
744 return false;
745 }
746
747 for (i = 0; bits >= 8; i++, bits -= 8)
748 {
749 if (r6->network.s6_addr[i] != host->s6_addr[i])
750 {
751 return false;
752 }
753 }
754
755 if (bits == 0)
756 {
757 return true;
758 }
759
760 mask = 0xff << (8-bits);
761
762 if ( (r6->network.s6_addr[i] & mask) == (host->s6_addr[i] & mask ))
763 {
764 return true;
765 }
766
767 return false;
768 }
769
770 bool
init_route_ipv6_list(struct route_ipv6_list * rl6,const struct route_ipv6_option_list * opt6,const char * remote_endpoint,int default_metric,const struct in6_addr * remote_host_ipv6,struct env_set * es,openvpn_net_ctx_t * ctx)771 init_route_ipv6_list(struct route_ipv6_list *rl6,
772 const struct route_ipv6_option_list *opt6,
773 const char *remote_endpoint,
774 int default_metric,
775 const struct in6_addr *remote_host_ipv6,
776 struct env_set *es,
777 openvpn_net_ctx_t *ctx)
778 {
779 struct gc_arena gc = gc_new();
780 bool ret = true;
781 bool need_remote_ipv6_route;
782
783 clear_route_ipv6_list(rl6);
784
785 rl6->flags = opt6->flags;
786
787 if (remote_host_ipv6)
788 {
789 rl6->remote_host_ipv6 = *remote_host_ipv6;
790 rl6->spec_flags |= RTSA_REMOTE_HOST;
791 }
792
793 if (default_metric >= 0)
794 {
795 rl6->default_metric = default_metric;
796 rl6->spec_flags |= RTSA_DEFAULT_METRIC;
797 }
798
799 msg(D_ROUTE, "GDG6: remote_host_ipv6=%s",
800 remote_host_ipv6 ? print_in6_addr(*remote_host_ipv6, 0, &gc) : "n/a" );
801
802 get_default_gateway_ipv6(&rl6->rgi6, remote_host_ipv6, ctx);
803 if (rl6->rgi6.flags & RGI_ADDR_DEFINED)
804 {
805 setenv_str(es, "net_gateway_ipv6", print_in6_addr(rl6->rgi6.gateway.addr_ipv6, 0, &gc));
806 #if defined(ENABLE_DEBUG) && !defined(ENABLE_SMALL)
807 print_default_gateway(D_ROUTE, NULL, &rl6->rgi6);
808 #endif
809 }
810 else
811 {
812 dmsg(D_ROUTE, "ROUTE6: default_gateway=UNDEF");
813 }
814
815 if (is_route_parm_defined( remote_endpoint ))
816 {
817 if (inet_pton( AF_INET6, remote_endpoint,
818 &rl6->remote_endpoint_ipv6) == 1)
819 {
820 rl6->spec_flags |= RTSA_REMOTE_ENDPOINT;
821 }
822 else
823 {
824 msg(M_WARN, PACKAGE_NAME " ROUTE: failed to parse/resolve VPN endpoint: %s", remote_endpoint);
825 ret = false;
826 }
827 }
828
829 /* parse the routes from opt6 to rl6
830 * discovering potential overlaps with remote_host_ipv6 in the process
831 */
832 need_remote_ipv6_route = false;
833
834 {
835 struct route_ipv6_option *ro6;
836 for (ro6 = opt6->routes_ipv6; ro6; ro6 = ro6->next)
837 {
838 struct route_ipv6 *r6;
839 ALLOC_OBJ_GC(r6, struct route_ipv6, &rl6->gc);
840 if (!init_route_ipv6(r6, ro6, rl6))
841 {
842 ret = false;
843 }
844 else
845 {
846 r6->next = rl6->routes_ipv6;
847 rl6->routes_ipv6 = r6;
848
849 #ifndef TARGET_ANDROID
850 /* On Android the VPNService protect function call will take of
851 * avoiding routing loops, so ignore this part and let
852 * need_remote_ipv6_route always evaluate to false
853 */
854 if (remote_host_ipv6
855 && route_ipv6_match_host( r6, remote_host_ipv6 ) )
856 {
857 need_remote_ipv6_route = true;
858 msg(D_ROUTE, "ROUTE6: %s/%d overlaps IPv6 remote %s, adding host route to VPN endpoint",
859 print_in6_addr(r6->network, 0, &gc), r6->netbits,
860 print_in6_addr(*remote_host_ipv6, 0, &gc));
861 }
862 #endif
863 }
864 }
865 }
866
867 /* add VPN server host route if needed */
868 if (need_remote_ipv6_route)
869 {
870 if ( (rl6->rgi6.flags & (RGI_ADDR_DEFINED|RGI_IFACE_DEFINED) ) ==
871 (RGI_ADDR_DEFINED|RGI_IFACE_DEFINED) )
872 {
873 struct route_ipv6 *r6;
874 ALLOC_OBJ_CLEAR_GC(r6, struct route_ipv6, &rl6->gc);
875
876 r6->network = *remote_host_ipv6;
877 r6->netbits = 128;
878 if (!(rl6->rgi6.flags & RGI_ON_LINK) )
879 {
880 r6->gateway = rl6->rgi6.gateway.addr_ipv6;
881 }
882 r6->metric = 1;
883 #ifdef _WIN32
884 r6->adapter_index = rl6->rgi6.adapter_index;
885 #else
886 r6->iface = rl6->rgi6.iface;
887 #endif
888 r6->flags = RT_DEFINED | RT_METRIC_DEFINED;
889
890 r6->next = rl6->routes_ipv6;
891 rl6->routes_ipv6 = r6;
892 }
893 else
894 {
895 msg(M_WARN, "ROUTE6: IPv6 route overlaps with IPv6 remote address, but could not determine IPv6 gateway address + interface, expect failure\n" );
896 }
897 }
898
899 gc_free(&gc);
900 return ret;
901 }
902
903 static void
add_route3(in_addr_t network,in_addr_t netmask,in_addr_t gateway,const struct tuntap * tt,unsigned int flags,const struct route_gateway_info * rgi,const struct env_set * es,openvpn_net_ctx_t * ctx)904 add_route3(in_addr_t network,
905 in_addr_t netmask,
906 in_addr_t gateway,
907 const struct tuntap *tt,
908 unsigned int flags,
909 const struct route_gateway_info *rgi,
910 const struct env_set *es,
911 openvpn_net_ctx_t *ctx)
912 {
913 struct route_ipv4 r;
914 CLEAR(r);
915 r.flags = RT_DEFINED;
916 r.network = network;
917 r.netmask = netmask;
918 r.gateway = gateway;
919 add_route(&r, tt, flags, rgi, es, ctx);
920 }
921
922 static void
del_route3(in_addr_t network,in_addr_t netmask,in_addr_t gateway,const struct tuntap * tt,unsigned int flags,const struct route_gateway_info * rgi,const struct env_set * es,openvpn_net_ctx_t * ctx)923 del_route3(in_addr_t network,
924 in_addr_t netmask,
925 in_addr_t gateway,
926 const struct tuntap *tt,
927 unsigned int flags,
928 const struct route_gateway_info *rgi,
929 const struct env_set *es,
930 openvpn_net_ctx_t *ctx)
931 {
932 struct route_ipv4 r;
933 CLEAR(r);
934 r.flags = RT_DEFINED|RT_ADDED;
935 r.network = network;
936 r.netmask = netmask;
937 r.gateway = gateway;
938 delete_route(&r, tt, flags, rgi, es, ctx);
939 }
940
941 static void
add_bypass_routes(struct route_bypass * rb,in_addr_t gateway,const struct tuntap * tt,unsigned int flags,const struct route_gateway_info * rgi,const struct env_set * es,openvpn_net_ctx_t * ctx)942 add_bypass_routes(struct route_bypass *rb,
943 in_addr_t gateway,
944 const struct tuntap *tt,
945 unsigned int flags,
946 const struct route_gateway_info *rgi,
947 const struct env_set *es,
948 openvpn_net_ctx_t *ctx)
949 {
950 int i;
951 for (i = 0; i < rb->n_bypass; ++i)
952 {
953 if (rb->bypass[i])
954 {
955 add_route3(rb->bypass[i],
956 IPV4_NETMASK_HOST,
957 gateway,
958 tt,
959 flags | ROUTE_REF_GW,
960 rgi,
961 es,
962 ctx);
963 }
964 }
965 }
966
967 static void
del_bypass_routes(struct route_bypass * rb,in_addr_t gateway,const struct tuntap * tt,unsigned int flags,const struct route_gateway_info * rgi,const struct env_set * es,openvpn_net_ctx_t * ctx)968 del_bypass_routes(struct route_bypass *rb,
969 in_addr_t gateway,
970 const struct tuntap *tt,
971 unsigned int flags,
972 const struct route_gateway_info *rgi,
973 const struct env_set *es,
974 openvpn_net_ctx_t *ctx)
975 {
976 int i;
977 for (i = 0; i < rb->n_bypass; ++i)
978 {
979 if (rb->bypass[i])
980 {
981 del_route3(rb->bypass[i],
982 IPV4_NETMASK_HOST,
983 gateway,
984 tt,
985 flags | ROUTE_REF_GW,
986 rgi,
987 es,
988 ctx);
989 }
990 }
991 }
992
993 static void
redirect_default_route_to_vpn(struct route_list * rl,const struct tuntap * tt,unsigned int flags,const struct env_set * es,openvpn_net_ctx_t * ctx)994 redirect_default_route_to_vpn(struct route_list *rl, const struct tuntap *tt,
995 unsigned int flags, const struct env_set *es,
996 openvpn_net_ctx_t *ctx)
997 {
998 const char err[] = "NOTE: unable to redirect IPv4 default gateway --";
999
1000 if (rl && rl->flags & RG_ENABLE)
1001 {
1002 bool local = rl->flags & RG_LOCAL;
1003
1004 if (!(rl->spec.flags & RTSA_REMOTE_ENDPOINT) && (rl->flags & RG_REROUTE_GW))
1005 {
1006 msg(M_WARN, "%s VPN gateway parameter (--route-gateway or --ifconfig) is missing", err);
1007 }
1008 /*
1009 * check if a default route is defined, unless:
1010 * - we are connecting to a remote host in our network
1011 * - we are connecting to a non-IPv4 remote host (i.e. we use IPv6)
1012 */
1013 else if (!(rl->rgi.flags & RGI_ADDR_DEFINED) && !local
1014 && (rl->spec.flags & RTSA_REMOTE_HOST))
1015 {
1016 msg(M_WARN, "%s Cannot read current default gateway from system", err);
1017 }
1018 else
1019 {
1020 #ifndef TARGET_ANDROID
1021 if (rl->flags & RG_AUTO_LOCAL)
1022 {
1023 const int tla = rl->spec.remote_host_local;
1024 if (tla == TLA_NONLOCAL)
1025 {
1026 dmsg(D_ROUTE, "ROUTE remote_host is NOT LOCAL");
1027 local = false;
1028 }
1029 else if (tla == TLA_LOCAL)
1030 {
1031 dmsg(D_ROUTE, "ROUTE remote_host is LOCAL");
1032 local = true;
1033 }
1034 }
1035 if (!local)
1036 {
1037 /* route remote host to original default gateway */
1038 /* if remote_host is not ipv4 (ie: ipv6), just skip
1039 * adding this special /32 route */
1040 if ((rl->spec.flags & RTSA_REMOTE_HOST)
1041 && rl->spec.remote_host != IPV4_INVALID_ADDR)
1042 {
1043 add_route3(rl->spec.remote_host,
1044 IPV4_NETMASK_HOST,
1045 rl->rgi.gateway.addr,
1046 tt,
1047 flags | ROUTE_REF_GW,
1048 &rl->rgi,
1049 es,
1050 ctx);
1051 rl->iflags |= RL_DID_LOCAL;
1052 }
1053 else
1054 {
1055 dmsg(D_ROUTE, "ROUTE remote_host protocol differs from tunneled");
1056 }
1057 }
1058 #endif /* ifndef TARGET_ANDROID */
1059
1060 /* route DHCP/DNS server traffic through original default gateway */
1061 add_bypass_routes(&rl->spec.bypass, rl->rgi.gateway.addr, tt, flags,
1062 &rl->rgi, es, ctx);
1063
1064 if (rl->flags & RG_REROUTE_GW)
1065 {
1066 if (rl->flags & RG_DEF1)
1067 {
1068 /* add new default route (1st component) */
1069 add_route3(0x00000000,
1070 0x80000000,
1071 rl->spec.remote_endpoint,
1072 tt,
1073 flags,
1074 &rl->rgi,
1075 es,
1076 ctx);
1077
1078 /* add new default route (2nd component) */
1079 add_route3(0x80000000,
1080 0x80000000,
1081 rl->spec.remote_endpoint,
1082 tt,
1083 flags,
1084 &rl->rgi,
1085 es,
1086 ctx);
1087 }
1088 else
1089 {
1090 /* don't try to remove the def route if it does not exist */
1091 if (rl->rgi.flags & RGI_ADDR_DEFINED)
1092 {
1093 /* delete default route */
1094 del_route3(0, 0, rl->rgi.gateway.addr, tt,
1095 flags | ROUTE_REF_GW, &rl->rgi, es, ctx);
1096 }
1097
1098 /* add new default route */
1099 add_route3(0,
1100 0,
1101 rl->spec.remote_endpoint,
1102 tt,
1103 flags,
1104 &rl->rgi,
1105 es,
1106 ctx);
1107 }
1108 }
1109
1110 /* set a flag so we can undo later */
1111 rl->iflags |= RL_DID_REDIRECT_DEFAULT_GATEWAY;
1112 }
1113 }
1114 }
1115
1116 static void
undo_redirect_default_route_to_vpn(struct route_list * rl,const struct tuntap * tt,unsigned int flags,const struct env_set * es,openvpn_net_ctx_t * ctx)1117 undo_redirect_default_route_to_vpn(struct route_list *rl,
1118 const struct tuntap *tt, unsigned int flags,
1119 const struct env_set *es,
1120 openvpn_net_ctx_t *ctx)
1121 {
1122 if (rl && rl->iflags & RL_DID_REDIRECT_DEFAULT_GATEWAY)
1123 {
1124 /* delete remote host route */
1125 if (rl->iflags & RL_DID_LOCAL)
1126 {
1127 del_route3(rl->spec.remote_host,
1128 IPV4_NETMASK_HOST,
1129 rl->rgi.gateway.addr,
1130 tt,
1131 flags | ROUTE_REF_GW,
1132 &rl->rgi,
1133 es,
1134 ctx);
1135 rl->iflags &= ~RL_DID_LOCAL;
1136 }
1137
1138 /* delete special DHCP/DNS bypass route */
1139 del_bypass_routes(&rl->spec.bypass, rl->rgi.gateway.addr, tt, flags,
1140 &rl->rgi, es, ctx);
1141
1142 if (rl->flags & RG_REROUTE_GW)
1143 {
1144 if (rl->flags & RG_DEF1)
1145 {
1146 /* delete default route (1st component) */
1147 del_route3(0x00000000,
1148 0x80000000,
1149 rl->spec.remote_endpoint,
1150 tt,
1151 flags,
1152 &rl->rgi,
1153 es,
1154 ctx);
1155
1156 /* delete default route (2nd component) */
1157 del_route3(0x80000000,
1158 0x80000000,
1159 rl->spec.remote_endpoint,
1160 tt,
1161 flags,
1162 &rl->rgi,
1163 es,
1164 ctx);
1165 }
1166 else
1167 {
1168 /* delete default route */
1169 del_route3(0,
1170 0,
1171 rl->spec.remote_endpoint,
1172 tt,
1173 flags,
1174 &rl->rgi,
1175 es,
1176 ctx);
1177 /* restore original default route if there was any */
1178 if (rl->rgi.flags & RGI_ADDR_DEFINED)
1179 {
1180 add_route3(0, 0, rl->rgi.gateway.addr, tt,
1181 flags | ROUTE_REF_GW, &rl->rgi, es, ctx);
1182 }
1183 }
1184 }
1185
1186 rl->iflags &= ~RL_DID_REDIRECT_DEFAULT_GATEWAY;
1187 }
1188 }
1189
1190 void
add_routes(struct route_list * rl,struct route_ipv6_list * rl6,const struct tuntap * tt,unsigned int flags,const struct env_set * es,openvpn_net_ctx_t * ctx)1191 add_routes(struct route_list *rl, struct route_ipv6_list *rl6,
1192 const struct tuntap *tt, unsigned int flags,
1193 const struct env_set *es, openvpn_net_ctx_t *ctx)
1194 {
1195 redirect_default_route_to_vpn(rl, tt, flags, es, ctx);
1196 if (rl && !(rl->iflags & RL_ROUTES_ADDED) )
1197 {
1198 struct route_ipv4 *r;
1199
1200 if (rl->routes && !tt->did_ifconfig_setup)
1201 {
1202 msg(M_INFO, "WARNING: OpenVPN was configured to add an IPv4 "
1203 "route. However, no IPv4 has been configured for %s, "
1204 "therefore the route installation may fail or may not work "
1205 "as expected.", tt->actual_name);
1206 }
1207
1208 #ifdef ENABLE_MANAGEMENT
1209 if (management && rl->routes)
1210 {
1211 management_set_state(management,
1212 OPENVPN_STATE_ADD_ROUTES,
1213 NULL,
1214 NULL,
1215 NULL,
1216 NULL,
1217 NULL);
1218 }
1219 #endif
1220
1221 for (r = rl->routes; r; r = r->next)
1222 {
1223 check_subnet_conflict(r->network, r->netmask, "route");
1224 if (flags & ROUTE_DELETE_FIRST)
1225 {
1226 delete_route(r, tt, flags, &rl->rgi, es, ctx);
1227 }
1228 add_route(r, tt, flags, &rl->rgi, es, ctx);
1229 }
1230 rl->iflags |= RL_ROUTES_ADDED;
1231 }
1232 if (rl6 && !(rl6->iflags & RL_ROUTES_ADDED) )
1233 {
1234 struct route_ipv6 *r;
1235
1236 if (!tt->did_ifconfig_ipv6_setup)
1237 {
1238 msg(M_INFO, "WARNING: OpenVPN was configured to add an IPv6 "
1239 "route. However, no IPv6 has been configured for %s, "
1240 "therefore the route installation may fail or may not work "
1241 "as expected.", tt->actual_name);
1242 }
1243
1244 for (r = rl6->routes_ipv6; r; r = r->next)
1245 {
1246 if (flags & ROUTE_DELETE_FIRST)
1247 {
1248 delete_route_ipv6(r, tt, flags, es, ctx);
1249 }
1250 add_route_ipv6(r, tt, flags, es, ctx);
1251 }
1252 rl6->iflags |= RL_ROUTES_ADDED;
1253 }
1254 }
1255
1256 void
delete_routes(struct route_list * rl,struct route_ipv6_list * rl6,const struct tuntap * tt,unsigned int flags,const struct env_set * es,openvpn_net_ctx_t * ctx)1257 delete_routes(struct route_list *rl, struct route_ipv6_list *rl6,
1258 const struct tuntap *tt, unsigned int flags,
1259 const struct env_set *es, openvpn_net_ctx_t *ctx)
1260 {
1261 if (rl && rl->iflags & RL_ROUTES_ADDED)
1262 {
1263 struct route_ipv4 *r;
1264 for (r = rl->routes; r; r = r->next)
1265 {
1266 delete_route(r, tt, flags, &rl->rgi, es, ctx);
1267 }
1268 rl->iflags &= ~RL_ROUTES_ADDED;
1269 }
1270
1271 undo_redirect_default_route_to_vpn(rl, tt, flags, es, ctx);
1272
1273 if (rl)
1274 {
1275 clear_route_list(rl);
1276 }
1277
1278 if (rl6 && (rl6->iflags & RL_ROUTES_ADDED) )
1279 {
1280 struct route_ipv6 *r6;
1281 for (r6 = rl6->routes_ipv6; r6; r6 = r6->next)
1282 {
1283 delete_route_ipv6(r6, tt, flags, es, ctx);
1284 }
1285 rl6->iflags &= ~RL_ROUTES_ADDED;
1286 }
1287
1288 if (rl6)
1289 {
1290 clear_route_ipv6_list(rl6);
1291 }
1292 }
1293
1294 #ifndef ENABLE_SMALL
1295
1296 static const char *
show_opt(const char * option)1297 show_opt(const char *option)
1298 {
1299 if (!option)
1300 {
1301 return "default (not set)";
1302 }
1303 else
1304 {
1305 return option;
1306 }
1307 }
1308
1309 static void
print_route_option(const struct route_option * ro,int level)1310 print_route_option(const struct route_option *ro, int level)
1311 {
1312 msg(level, " route %s/%s/%s/%s",
1313 show_opt(ro->network),
1314 show_opt(ro->netmask),
1315 show_opt(ro->gateway),
1316 show_opt(ro->metric));
1317 }
1318
1319 void
print_route_options(const struct route_option_list * rol,int level)1320 print_route_options(const struct route_option_list *rol,
1321 int level)
1322 {
1323 struct route_option *ro;
1324 if (rol->flags & RG_ENABLE)
1325 {
1326 msg(level, " [redirect_default_gateway local=%d]",
1327 (rol->flags & RG_LOCAL) != 0);
1328 }
1329 for (ro = rol->routes; ro; ro = ro->next)
1330 {
1331 print_route_option(ro, level);
1332 }
1333 }
1334
1335 void
print_default_gateway(const int msglevel,const struct route_gateway_info * rgi,const struct route_ipv6_gateway_info * rgi6)1336 print_default_gateway(const int msglevel,
1337 const struct route_gateway_info *rgi,
1338 const struct route_ipv6_gateway_info *rgi6)
1339 {
1340 struct gc_arena gc = gc_new();
1341 if (rgi && (rgi->flags & RGI_ADDR_DEFINED))
1342 {
1343 struct buffer out = alloc_buf_gc(256, &gc);
1344 buf_printf(&out, "ROUTE_GATEWAY");
1345 if (rgi->flags & RGI_ON_LINK)
1346 {
1347 buf_printf(&out, " ON_LINK");
1348 }
1349 else
1350 {
1351 buf_printf(&out, " %s", print_in_addr_t(rgi->gateway.addr, 0, &gc));
1352 }
1353 if (rgi->flags & RGI_NETMASK_DEFINED)
1354 {
1355 buf_printf(&out, "/%s", print_in_addr_t(rgi->gateway.netmask, 0, &gc));
1356 }
1357 #ifdef _WIN32
1358 if (rgi->flags & RGI_IFACE_DEFINED)
1359 {
1360 buf_printf(&out, " I=%lu", rgi->adapter_index);
1361 }
1362 #else
1363 if (rgi->flags & RGI_IFACE_DEFINED)
1364 {
1365 buf_printf(&out, " IFACE=%s", rgi->iface);
1366 }
1367 #endif
1368 if (rgi->flags & RGI_HWADDR_DEFINED)
1369 {
1370 buf_printf(&out, " HWADDR=%s", format_hex_ex(rgi->hwaddr, 6, 0, 1, ":", &gc));
1371 }
1372 msg(msglevel, "%s", BSTR(&out));
1373 }
1374
1375 if (rgi6 && (rgi6->flags & RGI_ADDR_DEFINED))
1376 {
1377 struct buffer out = alloc_buf_gc(256, &gc);
1378 buf_printf(&out, "ROUTE6_GATEWAY");
1379 buf_printf(&out, " %s", print_in6_addr(rgi6->gateway.addr_ipv6, 0, &gc));
1380 if (rgi6->flags & RGI_ON_LINK)
1381 {
1382 buf_printf(&out, " ON_LINK");
1383 }
1384 if (rgi6->flags & RGI_NETMASK_DEFINED)
1385 {
1386 buf_printf(&out, "/%d", rgi6->gateway.netbits_ipv6);
1387 }
1388 #ifdef _WIN32
1389 if (rgi6->flags & RGI_IFACE_DEFINED)
1390 {
1391 buf_printf(&out, " I=%lu", rgi6->adapter_index);
1392 }
1393 #else
1394 if (rgi6->flags & RGI_IFACE_DEFINED)
1395 {
1396 buf_printf(&out, " IFACE=%s", rgi6->iface);
1397 }
1398 #endif
1399 if (rgi6->flags & RGI_HWADDR_DEFINED)
1400 {
1401 buf_printf(&out, " HWADDR=%s", format_hex_ex(rgi6->hwaddr, 6, 0, 1, ":", &gc));
1402 }
1403 msg(msglevel, "%s", BSTR(&out));
1404 }
1405 gc_free(&gc);
1406 }
1407
1408 #endif /* ifndef ENABLE_SMALL */
1409
1410 static void
print_route(const struct route_ipv4 * r,int level)1411 print_route(const struct route_ipv4 *r, int level)
1412 {
1413 struct gc_arena gc = gc_new();
1414 if (r->flags & RT_DEFINED)
1415 {
1416 msg(level, "%s", route_string(r, &gc));
1417 }
1418 gc_free(&gc);
1419 }
1420
1421 void
print_routes(const struct route_list * rl,int level)1422 print_routes(const struct route_list *rl, int level)
1423 {
1424 struct route_ipv4 *r;
1425 for (r = rl->routes; r; r = r->next)
1426 {
1427 print_route(r, level);
1428 }
1429 }
1430
1431 static void
setenv_route(struct env_set * es,const struct route_ipv4 * r,int i)1432 setenv_route(struct env_set *es, const struct route_ipv4 *r, int i)
1433 {
1434 struct gc_arena gc = gc_new();
1435 if (r->flags & RT_DEFINED)
1436 {
1437 setenv_route_addr(es, "network", r->network, i);
1438 setenv_route_addr(es, "netmask", r->netmask, i);
1439 setenv_route_addr(es, "gateway", r->gateway, i);
1440
1441 if (r->flags & RT_METRIC_DEFINED)
1442 {
1443 struct buffer name = alloc_buf_gc(256, &gc);
1444 buf_printf(&name, "route_metric_%d", i);
1445 setenv_int(es, BSTR(&name), r->metric);
1446 }
1447 }
1448 gc_free(&gc);
1449 }
1450
1451 void
setenv_routes(struct env_set * es,const struct route_list * rl)1452 setenv_routes(struct env_set *es, const struct route_list *rl)
1453 {
1454 int i = 1;
1455 struct route_ipv4 *r;
1456 for (r = rl->routes; r; r = r->next)
1457 {
1458 setenv_route(es, r, i++);
1459 }
1460 }
1461
1462 static void
setenv_route_ipv6(struct env_set * es,const struct route_ipv6 * r6,int i)1463 setenv_route_ipv6(struct env_set *es, const struct route_ipv6 *r6, int i)
1464 {
1465 struct gc_arena gc = gc_new();
1466 if (r6->flags & RT_DEFINED)
1467 {
1468 struct buffer name1 = alloc_buf_gc( 256, &gc );
1469 struct buffer val = alloc_buf_gc( 256, &gc );
1470 struct buffer name2 = alloc_buf_gc( 256, &gc );
1471
1472 buf_printf( &name1, "route_ipv6_network_%d", i );
1473 buf_printf( &val, "%s/%d", print_in6_addr( r6->network, 0, &gc ),
1474 r6->netbits );
1475 setenv_str( es, BSTR(&name1), BSTR(&val) );
1476
1477 buf_printf( &name2, "route_ipv6_gateway_%d", i );
1478 setenv_str( es, BSTR(&name2), print_in6_addr( r6->gateway, 0, &gc ));
1479
1480 if (r6->flags & RT_METRIC_DEFINED)
1481 {
1482 struct buffer name3 = alloc_buf_gc( 256, &gc );
1483 buf_printf( &name3, "route_ipv6_metric_%d", i) ;
1484 setenv_int( es, BSTR(&name3), r6->metric);
1485 }
1486 }
1487 gc_free(&gc);
1488 }
1489 void
setenv_routes_ipv6(struct env_set * es,const struct route_ipv6_list * rl6)1490 setenv_routes_ipv6(struct env_set *es, const struct route_ipv6_list *rl6)
1491 {
1492 int i = 1;
1493 struct route_ipv6 *r6;
1494 for (r6 = rl6->routes_ipv6; r6; r6 = r6->next)
1495 {
1496 setenv_route_ipv6(es, r6, i++);
1497 }
1498 }
1499
1500 /*
1501 * local_route() determines whether the gateway of a provided host
1502 * route is on the same interface that owns the default gateway.
1503 * It uses the data structure
1504 * returned by get_default_gateway() (struct route_gateway_info)
1505 * to determine this. If the route is local, LR_MATCH is returned.
1506 * When adding routes into the kernel, if LR_MATCH is defined for
1507 * a given route, the route should explicitly reference the default
1508 * gateway interface as the route destination. For example, here
1509 * is an example on Linux that uses LR_MATCH:
1510 *
1511 * route add -net 10.10.0.1 netmask 255.255.255.255 dev eth0
1512 *
1513 * This capability is needed by the "default-gateway block-local"
1514 * directive, to allow client access to the local subnet to be
1515 * blocked but still allow access to the local default gateway.
1516 */
1517
1518 /* local_route() return values */
1519 #define LR_NOMATCH 0 /* route is not local */
1520 #define LR_MATCH 1 /* route is local */
1521 #define LR_ERROR 2 /* caller should abort adding route */
1522
1523 static int
local_route(in_addr_t network,in_addr_t netmask,in_addr_t gateway,const struct route_gateway_info * rgi)1524 local_route(in_addr_t network,
1525 in_addr_t netmask,
1526 in_addr_t gateway,
1527 const struct route_gateway_info *rgi)
1528 {
1529 /* set LR_MATCH on local host routes */
1530 const int rgi_needed = (RGI_ADDR_DEFINED|RGI_NETMASK_DEFINED|RGI_IFACE_DEFINED);
1531 if (rgi
1532 && (rgi->flags & rgi_needed) == rgi_needed
1533 && gateway == rgi->gateway.addr
1534 && netmask == 0xFFFFFFFF)
1535 {
1536 if (((network ^ rgi->gateway.addr) & rgi->gateway.netmask) == 0)
1537 {
1538 return LR_MATCH;
1539 }
1540 else
1541 {
1542 /* examine additional subnets on gateway interface */
1543 size_t i;
1544 for (i = 0; i < rgi->n_addrs; ++i)
1545 {
1546 const struct route_gateway_address *gwa = &rgi->addrs[i];
1547 if (((network ^ gwa->addr) & gwa->netmask) == 0)
1548 {
1549 return LR_MATCH;
1550 }
1551 }
1552 }
1553 }
1554 return LR_NOMATCH;
1555 }
1556
1557 /* Return true if the "on-link" form of the route should be used. This is when the gateway for a
1558 * a route is specified as an interface rather than an address. */
1559 static inline bool
is_on_link(const int is_local_route,const unsigned int flags,const struct route_gateway_info * rgi)1560 is_on_link(const int is_local_route, const unsigned int flags, const struct route_gateway_info *rgi)
1561 {
1562 return rgi && (is_local_route == LR_MATCH || ((flags & ROUTE_REF_GW) && (rgi->flags & RGI_ON_LINK)));
1563 }
1564
1565 void
add_route(struct route_ipv4 * r,const struct tuntap * tt,unsigned int flags,const struct route_gateway_info * rgi,const struct env_set * es,openvpn_net_ctx_t * ctx)1566 add_route(struct route_ipv4 *r,
1567 const struct tuntap *tt,
1568 unsigned int flags,
1569 const struct route_gateway_info *rgi, /* may be NULL */
1570 const struct env_set *es,
1571 openvpn_net_ctx_t *ctx)
1572 {
1573 struct gc_arena gc;
1574 struct argv argv = argv_new();
1575 #if !defined(TARGET_LINUX)
1576 const char *network;
1577 #if !defined(TARGET_AIX)
1578 const char *netmask;
1579 #endif
1580 const char *gateway;
1581 #endif
1582 bool status = false;
1583 int is_local_route;
1584
1585 if (!(r->flags & RT_DEFINED))
1586 {
1587 return;
1588 }
1589
1590 gc_init(&gc);
1591
1592 #if !defined(TARGET_LINUX)
1593 network = print_in_addr_t(r->network, 0, &gc);
1594 #if !defined(TARGET_AIX)
1595 netmask = print_in_addr_t(r->netmask, 0, &gc);
1596 #endif
1597 gateway = print_in_addr_t(r->gateway, 0, &gc);
1598 #endif
1599
1600 is_local_route = local_route(r->network, r->netmask, r->gateway, rgi);
1601 if (is_local_route == LR_ERROR)
1602 {
1603 goto done;
1604 }
1605
1606 #if defined(TARGET_LINUX)
1607 const char *iface = NULL;
1608 int metric = -1;
1609
1610 if (is_on_link(is_local_route, flags, rgi))
1611 {
1612 iface = rgi->iface;
1613 }
1614
1615 if (r->flags & RT_METRIC_DEFINED)
1616 {
1617 metric = r->metric;
1618 }
1619
1620 status = true;
1621 if (net_route_v4_add(ctx, &r->network, netmask_to_netbits2(r->netmask),
1622 &r->gateway, iface, 0, metric) < 0)
1623 {
1624 msg(M_WARN, "ERROR: Linux route add command failed");
1625 status = false;
1626 }
1627
1628 #elif defined (TARGET_ANDROID)
1629 char out[128];
1630
1631 if (rgi)
1632 {
1633 openvpn_snprintf(out, sizeof(out), "%s %s %s dev %s", network, netmask, gateway, rgi->iface);
1634 }
1635 else
1636 {
1637 openvpn_snprintf(out, sizeof(out), "%s %s %s", network, netmask, gateway);
1638 }
1639 management_android_control(management, "ROUTE", out);
1640
1641 #elif defined (_WIN32)
1642 {
1643 DWORD ai = TUN_ADAPTER_INDEX_INVALID;
1644 argv_printf(&argv, "%s%s ADD %s MASK %s %s",
1645 get_win_sys_path(),
1646 WIN_ROUTE_PATH_SUFFIX,
1647 network,
1648 netmask,
1649 gateway);
1650 if (r->flags & RT_METRIC_DEFINED)
1651 {
1652 argv_printf_cat(&argv, "METRIC %d", r->metric);
1653 }
1654 if (is_on_link(is_local_route, flags, rgi))
1655 {
1656 ai = rgi->adapter_index;
1657 argv_printf_cat(&argv, "IF %lu", ai);
1658 }
1659
1660 argv_msg(D_ROUTE, &argv);
1661
1662 if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_SERVICE)
1663 {
1664 status = add_route_service(r, tt);
1665 msg(D_ROUTE, "Route addition via service %s", status ? "succeeded" : "failed");
1666 }
1667 else if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_IPAPI)
1668 {
1669 status = add_route_ipapi(r, tt, ai);
1670 msg(D_ROUTE, "Route addition via IPAPI %s", status ? "succeeded" : "failed");
1671 }
1672 else if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_EXE)
1673 {
1674 netcmd_semaphore_lock();
1675 status = openvpn_execve_check(&argv, es, 0, "ERROR: Windows route add command failed");
1676 netcmd_semaphore_release();
1677 }
1678 else if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_ADAPTIVE)
1679 {
1680 status = add_route_ipapi(r, tt, ai);
1681 msg(D_ROUTE, "Route addition via IPAPI %s [adaptive]", status ? "succeeded" : "failed");
1682 if (!status)
1683 {
1684 msg(D_ROUTE, "Route addition fallback to route.exe");
1685 netcmd_semaphore_lock();
1686 status = openvpn_execve_check(&argv, es, 0, "ERROR: Windows route add command failed [adaptive]");
1687 netcmd_semaphore_release();
1688 }
1689 }
1690 else
1691 {
1692 ASSERT(0);
1693 }
1694 }
1695
1696 #elif defined (TARGET_SOLARIS)
1697
1698 /* example: route add 192.0.2.32 -netmask 255.255.255.224 somegateway */
1699
1700 argv_printf(&argv, "%s add",
1701 ROUTE_PATH);
1702
1703 argv_printf_cat(&argv, "%s -netmask %s %s",
1704 network,
1705 netmask,
1706 gateway);
1707
1708 /* Solaris can only distinguish between "metric 0" == "on-link on the
1709 * interface where the IP address given is configured" and "metric > 0"
1710 * == "use gateway specified" (no finer-grained route metrics available)
1711 *
1712 * More recent versions of Solaris can also do "-interface", but that
1713 * would break backwards compatibility with older versions for no gain.
1714 */
1715 if (r->flags & RT_METRIC_DEFINED)
1716 {
1717 argv_printf_cat(&argv, "%d", r->metric);
1718 }
1719
1720 argv_msg(D_ROUTE, &argv);
1721 status = openvpn_execve_check(&argv, es, 0, "ERROR: Solaris route add command failed");
1722
1723 #elif defined(TARGET_FREEBSD)
1724
1725 argv_printf(&argv, "%s add",
1726 ROUTE_PATH);
1727
1728 #if 0
1729 if (r->flags & RT_METRIC_DEFINED)
1730 {
1731 argv_printf_cat(&argv, "-rtt %d", r->metric);
1732 }
1733 #endif
1734
1735 argv_printf_cat(&argv, "-net %s %s %s",
1736 network,
1737 gateway,
1738 netmask);
1739
1740 /* FIXME -- add on-link support for FreeBSD */
1741
1742 argv_msg(D_ROUTE, &argv);
1743 status = openvpn_execve_check(&argv, es, 0, "ERROR: FreeBSD route add command failed");
1744
1745 #elif defined(TARGET_DRAGONFLY)
1746
1747 argv_printf(&argv, "%s add",
1748 ROUTE_PATH);
1749
1750 #if 0
1751 if (r->flags & RT_METRIC_DEFINED)
1752 {
1753 argv_printf_cat(&argv, "-rtt %d", r->metric);
1754 }
1755 #endif
1756
1757 argv_printf_cat(&argv, "-net %s %s %s",
1758 network,
1759 gateway,
1760 netmask);
1761
1762 /* FIXME -- add on-link support for Dragonfly */
1763
1764 argv_msg(D_ROUTE, &argv);
1765 status = openvpn_execve_check(&argv, es, 0, "ERROR: DragonFly route add command failed");
1766
1767 #elif defined(TARGET_DARWIN)
1768
1769 argv_printf(&argv, "%s add",
1770 ROUTE_PATH);
1771
1772 #if 0
1773 if (r->flags & RT_METRIC_DEFINED)
1774 {
1775 argv_printf_cat(&argv, "-rtt %d", r->metric);
1776 }
1777 #endif
1778
1779 if (is_on_link(is_local_route, flags, rgi))
1780 {
1781 /* Mac OS X route syntax for ON_LINK:
1782 * route add -cloning -net 10.10.0.1 -netmask 255.255.255.255 -interface en0 */
1783 argv_printf_cat(&argv, "-cloning -net %s -netmask %s -interface %s",
1784 network,
1785 netmask,
1786 rgi->iface);
1787 }
1788 else
1789 {
1790 argv_printf_cat(&argv, "-net %s %s %s",
1791 network,
1792 gateway,
1793 netmask);
1794 }
1795
1796 argv_msg(D_ROUTE, &argv);
1797 status = openvpn_execve_check(&argv, es, 0, "ERROR: OS X route add command failed");
1798
1799 #elif defined(TARGET_OPENBSD) || defined(TARGET_NETBSD)
1800
1801 argv_printf(&argv, "%s add",
1802 ROUTE_PATH);
1803
1804 #if 0
1805 if (r->flags & RT_METRIC_DEFINED)
1806 {
1807 argv_printf_cat(&argv, "-rtt %d", r->metric);
1808 }
1809 #endif
1810
1811 argv_printf_cat(&argv, "-net %s %s -netmask %s",
1812 network,
1813 gateway,
1814 netmask);
1815
1816 /* FIXME -- add on-link support for OpenBSD/NetBSD */
1817
1818 argv_msg(D_ROUTE, &argv);
1819 status = openvpn_execve_check(&argv, es, 0, "ERROR: OpenBSD/NetBSD route add command failed");
1820
1821 #elif defined(TARGET_AIX)
1822
1823 {
1824 int netbits = netmask_to_netbits2(r->netmask);
1825 argv_printf(&argv, "%s add -net %s/%d %s",
1826 ROUTE_PATH,
1827 network, netbits, gateway);
1828 argv_msg(D_ROUTE, &argv);
1829 status = openvpn_execve_check(&argv, es, 0, "ERROR: AIX route add command failed");
1830 }
1831
1832 #else /* if defined(TARGET_LINUX) */
1833 msg(M_FATAL, "Sorry, but I don't know how to do 'route' commands on this operating system. Try putting your routes in a --route-up script");
1834 #endif /* if defined(TARGET_LINUX) */
1835
1836 done:
1837 if (status)
1838 {
1839 r->flags |= RT_ADDED;
1840 }
1841 else
1842 {
1843 r->flags &= ~RT_ADDED;
1844 }
1845 argv_free(&argv);
1846 gc_free(&gc);
1847 /* release resources potentially allocated during route setup */
1848 net_ctx_reset(ctx);
1849 }
1850
1851
1852 void
route_ipv6_clear_host_bits(struct route_ipv6 * r6)1853 route_ipv6_clear_host_bits( struct route_ipv6 *r6 )
1854 {
1855 /* clear host bit parts of route
1856 * (needed if routes are specified improperly, or if we need to
1857 * explicitly setup/clear the "connected" network routes on some OSes)
1858 */
1859 int byte = 15;
1860 int bits_to_clear = 128 - r6->netbits;
1861
1862 while (byte >= 0 && bits_to_clear > 0)
1863 {
1864 if (bits_to_clear >= 8)
1865 {
1866 r6->network.s6_addr[byte--] = 0; bits_to_clear -= 8;
1867 }
1868 else
1869 {
1870 r6->network.s6_addr[byte--] &= (0xff << bits_to_clear); bits_to_clear = 0;
1871 }
1872 }
1873 }
1874
1875 void
add_route_ipv6(struct route_ipv6 * r6,const struct tuntap * tt,unsigned int flags,const struct env_set * es,openvpn_net_ctx_t * ctx)1876 add_route_ipv6(struct route_ipv6 *r6, const struct tuntap *tt,
1877 unsigned int flags, const struct env_set *es,
1878 openvpn_net_ctx_t *ctx)
1879 {
1880 struct gc_arena gc;
1881 struct argv argv = argv_new();
1882
1883 const char *network;
1884 const char *gateway;
1885 bool status = false;
1886 const char *device = tt->actual_name;
1887 #if defined(TARGET_LINUX)
1888 int metric;
1889 #endif
1890 bool gateway_needed = false;
1891
1892 if (!(r6->flags & RT_DEFINED) )
1893 {
1894 return;
1895 }
1896
1897 #ifndef _WIN32
1898 if (r6->iface != NULL) /* vpn server special route */
1899 {
1900 device = r6->iface;
1901 if (!IN6_IS_ADDR_UNSPECIFIED(&r6->gateway) )
1902 {
1903 gateway_needed = true;
1904 }
1905 }
1906 #endif
1907
1908 gc_init(&gc);
1909
1910 route_ipv6_clear_host_bits(r6);
1911
1912 network = print_in6_addr( r6->network, 0, &gc);
1913 gateway = print_in6_addr( r6->gateway, 0, &gc);
1914
1915 #if defined(TARGET_DARWIN) \
1916 || defined(TARGET_FREEBSD) || defined(TARGET_DRAGONFLY) \
1917 || defined(TARGET_OPENBSD) || defined(TARGET_NETBSD)
1918
1919 /* the BSD platforms cannot specify gateway and interface independently,
1920 * but for link-local destinations, we MUST specify the interface, so
1921 * we build a combined "$gateway%$interface" gateway string
1922 */
1923 if (r6->iface != NULL && gateway_needed
1924 && IN6_IS_ADDR_LINKLOCAL(&r6->gateway) ) /* fe80::...%intf */
1925 {
1926 int len = strlen(gateway) + 1 + strlen(r6->iface)+1;
1927 char *tmp = gc_malloc( len, true, &gc );
1928 snprintf( tmp, len, "%s%%%s", gateway, r6->iface );
1929 gateway = tmp;
1930 }
1931 #endif
1932
1933 msg( M_INFO, "add_route_ipv6(%s/%d -> %s metric %d) dev %s",
1934 network, r6->netbits, gateway, r6->metric, device );
1935
1936 /*
1937 * Filter out routes which are essentially no-ops
1938 * (not currently done for IPv6)
1939 */
1940
1941 /* On "tun" interface, we never set a gateway if the operating system
1942 * can do "route to interface" - it does not add value, as the target
1943 * dev already fully qualifies the route destination on point-to-point
1944 * interfaces. OTOH, on "tap" interface, we must always set the
1945 * gateway unless the route is to be an on-link network
1946 */
1947 if (tt->type == DEV_TYPE_TAP
1948 && !( (r6->flags & RT_METRIC_DEFINED) && r6->metric == 0 ) )
1949 {
1950 gateway_needed = true;
1951 }
1952
1953 if (gateway_needed && IN6_IS_ADDR_UNSPECIFIED(&r6->gateway))
1954 {
1955 msg(M_WARN, "ROUTE6 WARNING: " PACKAGE_NAME " needs a gateway "
1956 "parameter for a --route-ipv6 option and no default was set via "
1957 "--ifconfig-ipv6 or --route-ipv6-gateway option. Not installing "
1958 "IPv6 route to %s/%d.", network, r6->netbits);
1959 status = false;
1960 goto done;
1961 }
1962
1963 #if defined(TARGET_LINUX)
1964 metric = -1;
1965 if ((r6->flags & RT_METRIC_DEFINED) && (r6->metric > 0))
1966 {
1967 metric = r6->metric;
1968 }
1969
1970 status = true;
1971 if (net_route_v6_add(ctx, &r6->network, r6->netbits,
1972 gateway_needed ? &r6->gateway : NULL, device, 0,
1973 metric) < 0)
1974 {
1975 msg(M_WARN, "ERROR: Linux IPv6 route can't be added");
1976 status = false;
1977 }
1978
1979 #elif defined (TARGET_ANDROID)
1980 char out[64];
1981
1982 openvpn_snprintf(out, sizeof(out), "%s/%d %s", network, r6->netbits, device);
1983
1984 management_android_control(management, "ROUTE6", out);
1985
1986 #elif defined (_WIN32)
1987
1988 if (tt->options.msg_channel)
1989 {
1990 status = add_route_ipv6_service(r6, tt);
1991 }
1992 else
1993 {
1994 DWORD adapter_index;
1995 if (r6->adapter_index) /* vpn server special route */
1996 {
1997 adapter_index = r6->adapter_index;
1998 gateway_needed = true;
1999 }
2000 else
2001 {
2002 adapter_index = tt->adapter_index;
2003 }
2004
2005 /* netsh interface ipv6 add route 2001:db8::/32 42 */
2006 argv_printf(&argv, "%s%s interface ipv6 add route %s/%d %lu",
2007 get_win_sys_path(),
2008 NETSH_PATH_SUFFIX,
2009 network,
2010 r6->netbits,
2011 adapter_index);
2012
2013 /* next-hop depends on TUN or TAP mode:
2014 * - in TAP mode, we use the "real" next-hop
2015 * - in TUN mode we use a special-case link-local address that the tapdrvr
2016 * knows about and will answer ND (neighbor discovery) packets for
2017 */
2018 if (tt->type == DEV_TYPE_TUN && !gateway_needed)
2019 {
2020 argv_printf_cat( &argv, " %s", "fe80::8" );
2021 }
2022 else if (!IN6_IS_ADDR_UNSPECIFIED(&r6->gateway) )
2023 {
2024 argv_printf_cat( &argv, " %s", gateway );
2025 }
2026
2027 #if 0
2028 if (r6->flags & RT_METRIC_DEFINED)
2029 {
2030 argv_printf_cat(&argv, " METRIC %d", r->metric);
2031 }
2032 #endif
2033
2034 /* in some versions of Windows, routes are persistent across reboots by
2035 * default, unless "store=active" is set (pointed out by Tony Lim, thanks)
2036 */
2037 argv_printf_cat( &argv, " store=active" );
2038
2039 argv_msg(D_ROUTE, &argv);
2040
2041 netcmd_semaphore_lock();
2042 status = openvpn_execve_check(&argv, es, 0, "ERROR: Windows route add ipv6 command failed");
2043 netcmd_semaphore_release();
2044 }
2045
2046 #elif defined (TARGET_SOLARIS)
2047
2048 /* example: route add -inet6 2001:db8::/32 somegateway 0 */
2049
2050 /* for some reason, routes to tun/tap do not work for me unless I set
2051 * "metric 0" - otherwise, the routes will be nicely installed, but
2052 * packets will just disappear somewhere. So we always use "0" now,
2053 * unless the route points to "gateway on other interface"...
2054 *
2055 * (Note: OpenSolaris can not specify host%interface gateways, so we just
2056 * use the GW addresses - it seems to still work for fe80:: addresses,
2057 * however this is done internally. NUD maybe?)
2058 */
2059 argv_printf(&argv, "%s add -inet6 %s/%d %s",
2060 ROUTE_PATH,
2061 network,
2062 r6->netbits,
2063 gateway );
2064
2065 /* on tun (not tap), not "elsewhere"? -> metric 0 */
2066 if (tt->type == DEV_TYPE_TUN && !r6->iface)
2067 {
2068 argv_printf_cat(&argv, "0");
2069 }
2070
2071 argv_msg(D_ROUTE, &argv);
2072 status = openvpn_execve_check(&argv, es, 0, "ERROR: Solaris route add -inet6 command failed");
2073
2074 #elif defined(TARGET_FREEBSD) || defined(TARGET_DRAGONFLY)
2075
2076 argv_printf(&argv, "%s add -inet6 %s/%d",
2077 ROUTE_PATH,
2078 network,
2079 r6->netbits);
2080
2081 if (gateway_needed)
2082 {
2083 argv_printf_cat(&argv, "%s", gateway);
2084 }
2085 else
2086 {
2087 argv_printf_cat(&argv, "-iface %s", device);
2088 }
2089
2090 argv_msg(D_ROUTE, &argv);
2091 status = openvpn_execve_check(&argv, es, 0, "ERROR: *BSD route add -inet6 command failed");
2092
2093 #elif defined(TARGET_DARWIN)
2094
2095 argv_printf(&argv, "%s add -inet6 %s -prefixlen %d",
2096 ROUTE_PATH,
2097 network, r6->netbits );
2098
2099 if (gateway_needed)
2100 {
2101 argv_printf_cat(&argv, "%s", gateway);
2102 }
2103 else
2104 {
2105 argv_printf_cat(&argv, "-iface %s", device);
2106 }
2107
2108 argv_msg(D_ROUTE, &argv);
2109 status = openvpn_execve_check(&argv, es, 0, "ERROR: MacOS X route add -inet6 command failed");
2110
2111 #elif defined(TARGET_OPENBSD)
2112
2113 argv_printf(&argv, "%s add -inet6 %s -prefixlen %d %s",
2114 ROUTE_PATH,
2115 network, r6->netbits, gateway );
2116
2117 argv_msg(D_ROUTE, &argv);
2118 status = openvpn_execve_check(&argv, es, 0, "ERROR: OpenBSD route add -inet6 command failed");
2119
2120 #elif defined(TARGET_NETBSD)
2121
2122 argv_printf(&argv, "%s add -inet6 %s/%d %s",
2123 ROUTE_PATH,
2124 network, r6->netbits, gateway );
2125
2126 argv_msg(D_ROUTE, &argv);
2127 status = openvpn_execve_check(&argv, es, 0, "ERROR: NetBSD route add -inet6 command failed");
2128
2129 #elif defined(TARGET_AIX)
2130
2131 argv_printf(&argv, "%s add -inet6 %s/%d %s",
2132 ROUTE_PATH,
2133 network, r6->netbits, gateway);
2134 argv_msg(D_ROUTE, &argv);
2135 status = openvpn_execve_check(&argv, es, 0, "ERROR: AIX route add command failed");
2136
2137 #else /* if defined(TARGET_LINUX) */
2138 msg(M_FATAL, "Sorry, but I don't know how to do 'route ipv6' commands on this operating system. Try putting your routes in a --route-up script");
2139 #endif /* if defined(TARGET_LINUX) */
2140
2141 done:
2142 if (status)
2143 {
2144 r6->flags |= RT_ADDED;
2145 }
2146 else
2147 {
2148 r6->flags &= ~RT_ADDED;
2149 }
2150 argv_free(&argv);
2151 gc_free(&gc);
2152 /* release resources potentially allocated during route setup */
2153 net_ctx_reset(ctx);
2154 }
2155
2156 static void
delete_route(struct route_ipv4 * r,const struct tuntap * tt,unsigned int flags,const struct route_gateway_info * rgi,const struct env_set * es,openvpn_net_ctx_t * ctx)2157 delete_route(struct route_ipv4 *r,
2158 const struct tuntap *tt,
2159 unsigned int flags,
2160 const struct route_gateway_info *rgi,
2161 const struct env_set *es,
2162 openvpn_net_ctx_t *ctx)
2163 {
2164 struct gc_arena gc;
2165 struct argv argv = argv_new();
2166 #if !defined(TARGET_LINUX)
2167 const char *network;
2168 #if !defined(TARGET_AIX)
2169 const char *netmask;
2170 #endif
2171 #if !defined(TARGET_ANDROID)
2172 const char *gateway;
2173 #endif
2174 #else /* if !defined(TARGET_LINUX) */
2175 int metric;
2176 #endif
2177 int is_local_route;
2178
2179 if ((r->flags & (RT_DEFINED|RT_ADDED)) != (RT_DEFINED|RT_ADDED))
2180 {
2181 return;
2182 }
2183
2184 gc_init(&gc);
2185
2186 #if !defined(TARGET_LINUX)
2187 network = print_in_addr_t(r->network, 0, &gc);
2188 #if !defined(TARGET_AIX)
2189 netmask = print_in_addr_t(r->netmask, 0, &gc);
2190 #endif
2191 #if !defined(TARGET_ANDROID)
2192 gateway = print_in_addr_t(r->gateway, 0, &gc);
2193 #endif
2194 #endif
2195
2196 is_local_route = local_route(r->network, r->netmask, r->gateway, rgi);
2197 if (is_local_route == LR_ERROR)
2198 {
2199 goto done;
2200 }
2201
2202 #if defined(TARGET_LINUX)
2203 metric = -1;
2204 if (r->flags & RT_METRIC_DEFINED)
2205 {
2206 metric = r->metric;
2207 }
2208
2209 if (net_route_v4_del(ctx, &r->network, netmask_to_netbits2(r->netmask),
2210 &r->gateway, NULL, 0, metric) < 0)
2211 {
2212 msg(M_WARN, "ERROR: Linux route delete command failed");
2213 }
2214 #elif defined (_WIN32)
2215
2216 argv_printf(&argv, "%s%s DELETE %s MASK %s %s",
2217 get_win_sys_path(),
2218 WIN_ROUTE_PATH_SUFFIX,
2219 network,
2220 netmask,
2221 gateway);
2222
2223 argv_msg(D_ROUTE, &argv);
2224
2225 if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_SERVICE)
2226 {
2227 const bool status = del_route_service(r, tt);
2228 msg(D_ROUTE, "Route deletion via service %s", status ? "succeeded" : "failed");
2229 }
2230 else if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_IPAPI)
2231 {
2232 const bool status = del_route_ipapi(r, tt);
2233 msg(D_ROUTE, "Route deletion via IPAPI %s", status ? "succeeded" : "failed");
2234 }
2235 else if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_EXE)
2236 {
2237 netcmd_semaphore_lock();
2238 openvpn_execve_check(&argv, es, 0, "ERROR: Windows route delete command failed");
2239 netcmd_semaphore_release();
2240 }
2241 else if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_ADAPTIVE)
2242 {
2243 const bool status = del_route_ipapi(r, tt);
2244 msg(D_ROUTE, "Route deletion via IPAPI %s [adaptive]", status ? "succeeded" : "failed");
2245 if (!status)
2246 {
2247 msg(D_ROUTE, "Route deletion fallback to route.exe");
2248 netcmd_semaphore_lock();
2249 openvpn_execve_check(&argv, es, 0, "ERROR: Windows route delete command failed [adaptive]");
2250 netcmd_semaphore_release();
2251 }
2252 }
2253 else
2254 {
2255 ASSERT(0);
2256 }
2257
2258 #elif defined (TARGET_SOLARIS)
2259
2260 argv_printf(&argv, "%s delete %s -netmask %s %s",
2261 ROUTE_PATH,
2262 network,
2263 netmask,
2264 gateway);
2265
2266 argv_msg(D_ROUTE, &argv);
2267 openvpn_execve_check(&argv, es, 0, "ERROR: Solaris route delete command failed");
2268
2269 #elif defined(TARGET_FREEBSD)
2270
2271 argv_printf(&argv, "%s delete -net %s %s %s",
2272 ROUTE_PATH,
2273 network,
2274 gateway,
2275 netmask);
2276
2277 argv_msg(D_ROUTE, &argv);
2278 openvpn_execve_check(&argv, es, 0, "ERROR: FreeBSD route delete command failed");
2279
2280 #elif defined(TARGET_DRAGONFLY)
2281
2282 argv_printf(&argv, "%s delete -net %s %s %s",
2283 ROUTE_PATH,
2284 network,
2285 gateway,
2286 netmask);
2287
2288 argv_msg(D_ROUTE, &argv);
2289 openvpn_execve_check(&argv, es, 0, "ERROR: DragonFly route delete command failed");
2290
2291 #elif defined(TARGET_DARWIN)
2292
2293 if (is_on_link(is_local_route, flags, rgi))
2294 {
2295 argv_printf(&argv, "%s delete -cloning -net %s -netmask %s -interface %s",
2296 ROUTE_PATH,
2297 network,
2298 netmask,
2299 rgi->iface);
2300 }
2301 else
2302 {
2303 argv_printf(&argv, "%s delete -net %s %s %s",
2304 ROUTE_PATH,
2305 network,
2306 gateway,
2307 netmask);
2308 }
2309
2310 argv_msg(D_ROUTE, &argv);
2311 openvpn_execve_check(&argv, es, 0, "ERROR: OS X route delete command failed");
2312
2313 #elif defined(TARGET_OPENBSD) || defined(TARGET_NETBSD)
2314
2315 argv_printf(&argv, "%s delete -net %s %s -netmask %s",
2316 ROUTE_PATH,
2317 network,
2318 gateway,
2319 netmask);
2320
2321 argv_msg(D_ROUTE, &argv);
2322 openvpn_execve_check(&argv, es, 0, "ERROR: OpenBSD/NetBSD route delete command failed");
2323
2324 #elif defined(TARGET_ANDROID)
2325 msg(M_NONFATAL, "Sorry, deleting routes on Android is not possible. The VpnService API allows routes to be set on connect only.");
2326
2327 #elif defined(TARGET_AIX)
2328
2329 {
2330 int netbits = netmask_to_netbits2(r->netmask);
2331 argv_printf(&argv, "%s delete -net %s/%d %s",
2332 ROUTE_PATH,
2333 network, netbits, gateway);
2334 argv_msg(D_ROUTE, &argv);
2335 openvpn_execve_check(&argv, es, 0, "ERROR: AIX route delete command failed");
2336 }
2337
2338 #else /* if defined(TARGET_LINUX) */
2339 msg(M_FATAL, "Sorry, but I don't know how to do 'route' commands on this operating system. Try putting your routes in a --route-up script");
2340 #endif /* if defined(TARGET_LINUX) */
2341
2342 done:
2343 r->flags &= ~RT_ADDED;
2344 argv_free(&argv);
2345 gc_free(&gc);
2346 /* release resources potentially allocated during route cleanup */
2347 net_ctx_reset(ctx);
2348 }
2349
2350 void
delete_route_ipv6(const struct route_ipv6 * r6,const struct tuntap * tt,unsigned int flags,const struct env_set * es,openvpn_net_ctx_t * ctx)2351 delete_route_ipv6(const struct route_ipv6 *r6, const struct tuntap *tt,
2352 unsigned int flags, const struct env_set *es,
2353 openvpn_net_ctx_t *ctx)
2354 {
2355 struct gc_arena gc;
2356 struct argv argv = argv_new();
2357 const char *network;
2358 #if !defined(TARGET_LINUX)
2359 const char *gateway;
2360 #else
2361 int metric;
2362 #endif
2363 bool gateway_needed = false;
2364
2365 if ((r6->flags & (RT_DEFINED|RT_ADDED)) != (RT_DEFINED|RT_ADDED))
2366 {
2367 return;
2368 }
2369
2370 #ifndef _WIN32
2371 const char *device = tt->actual_name;
2372 if (r6->iface != NULL) /* vpn server special route */
2373 {
2374 device = r6->iface;
2375 gateway_needed = true;
2376 }
2377 #endif
2378
2379 gc_init(&gc);
2380
2381 network = print_in6_addr( r6->network, 0, &gc);
2382 #if !defined(TARGET_LINUX)
2383 gateway = print_in6_addr( r6->gateway, 0, &gc);
2384 #endif
2385
2386 #if defined(TARGET_DARWIN) \
2387 || defined(TARGET_FREEBSD) || defined(TARGET_DRAGONFLY) \
2388 || defined(TARGET_OPENBSD) || defined(TARGET_NETBSD)
2389
2390 /* the BSD platforms cannot specify gateway and interface independently,
2391 * but for link-local destinations, we MUST specify the interface, so
2392 * we build a combined "$gateway%$interface" gateway string
2393 */
2394 if (r6->iface != NULL && gateway_needed
2395 && IN6_IS_ADDR_LINKLOCAL(&r6->gateway) ) /* fe80::...%intf */
2396 {
2397 int len = strlen(gateway) + 1 + strlen(r6->iface)+1;
2398 char *tmp = gc_malloc( len, true, &gc );
2399 snprintf( tmp, len, "%s%%%s", gateway, r6->iface );
2400 gateway = tmp;
2401 }
2402 #endif
2403
2404 msg( M_INFO, "delete_route_ipv6(%s/%d)", network, r6->netbits );
2405
2406 /* if we used a gateway on "add route", we also need to specify it on
2407 * delete, otherwise some OSes will refuse to delete the route
2408 */
2409 if (tt->type == DEV_TYPE_TAP
2410 && !( (r6->flags & RT_METRIC_DEFINED) && r6->metric == 0 ) )
2411 {
2412 gateway_needed = true;
2413 }
2414
2415 #if defined(TARGET_LINUX)
2416 metric = -1;
2417 if ((r6->flags & RT_METRIC_DEFINED) && (r6->metric > 0))
2418 {
2419 metric = r6->metric;
2420 }
2421
2422 if (net_route_v6_del(ctx, &r6->network, r6->netbits,
2423 gateway_needed ? &r6->gateway : NULL, device, 0,
2424 metric) < 0)
2425 {
2426 msg(M_WARN, "ERROR: Linux route v6 delete command failed");
2427 }
2428
2429 #elif defined (_WIN32)
2430
2431 if (tt->options.msg_channel)
2432 {
2433 del_route_ipv6_service(r6, tt);
2434 }
2435 else
2436 {
2437 DWORD adapter_index;
2438 if (r6->adapter_index) /* vpn server special route */
2439 {
2440 adapter_index = r6->adapter_index;
2441 gateway_needed = true;
2442 }
2443 else
2444 {
2445 adapter_index = tt->adapter_index;
2446 }
2447
2448 /* netsh interface ipv6 delete route 2001:db8::/32 42 */
2449 argv_printf(&argv, "%s%s interface ipv6 delete route %s/%d %lu",
2450 get_win_sys_path(),
2451 NETSH_PATH_SUFFIX,
2452 network,
2453 r6->netbits,
2454 adapter_index);
2455
2456 /* next-hop depends on TUN or TAP mode:
2457 * - in TAP mode, we use the "real" next-hop
2458 * - in TUN mode we use a special-case link-local address that the tapdrvr
2459 * knows about and will answer ND (neighbor discovery) packets for
2460 * (and "route deletion without specifying next-hop" does not work...)
2461 */
2462 if (tt->type == DEV_TYPE_TUN && !gateway_needed)
2463 {
2464 argv_printf_cat( &argv, " %s", "fe80::8" );
2465 }
2466 else if (!IN6_IS_ADDR_UNSPECIFIED(&r6->gateway) )
2467 {
2468 argv_printf_cat( &argv, " %s", gateway );
2469 }
2470
2471 #if 0
2472 if (r6->flags & RT_METRIC_DEFINED)
2473 {
2474 argv_printf_cat(&argv, "METRIC %d", r->metric);
2475 }
2476 #endif
2477
2478 /* Windows XP to 7 "just delete" routes, wherever they came from, but
2479 * in Windows 8(.1?), if you create them with "store=active", this is
2480 * how you should delete them as well (pointed out by Cedric Tabary)
2481 */
2482 argv_printf_cat( &argv, " store=active" );
2483
2484 argv_msg(D_ROUTE, &argv);
2485
2486 netcmd_semaphore_lock();
2487 openvpn_execve_check(&argv, es, 0, "ERROR: Windows route delete ipv6 command failed");
2488 netcmd_semaphore_release();
2489 }
2490
2491 #elif defined (TARGET_SOLARIS)
2492
2493 /* example: route delete -inet6 2001:db8::/32 somegateway */
2494
2495 argv_printf(&argv, "%s delete -inet6 %s/%d %s",
2496 ROUTE_PATH,
2497 network,
2498 r6->netbits,
2499 gateway );
2500
2501 argv_msg(D_ROUTE, &argv);
2502 openvpn_execve_check(&argv, es, 0, "ERROR: Solaris route delete -inet6 command failed");
2503
2504 #elif defined(TARGET_FREEBSD) || defined(TARGET_DRAGONFLY)
2505
2506 argv_printf(&argv, "%s delete -inet6 %s/%d",
2507 ROUTE_PATH,
2508 network,
2509 r6->netbits );
2510
2511 if (gateway_needed)
2512 {
2513 argv_printf_cat(&argv, "%s", gateway);
2514 }
2515 else
2516 {
2517 argv_printf_cat(&argv, "-iface %s", device);
2518 }
2519
2520 argv_msg(D_ROUTE, &argv);
2521 openvpn_execve_check(&argv, es, 0, "ERROR: *BSD route delete -inet6 command failed");
2522
2523 #elif defined(TARGET_DARWIN)
2524
2525 argv_printf(&argv, "%s delete -inet6 %s -prefixlen %d",
2526 ROUTE_PATH,
2527 network, r6->netbits );
2528
2529 if (gateway_needed)
2530 {
2531 argv_printf_cat(&argv, "%s", gateway);
2532 }
2533 else
2534 {
2535 argv_printf_cat(&argv, "-iface %s", device);
2536 }
2537
2538 argv_msg(D_ROUTE, &argv);
2539 openvpn_execve_check(&argv, es, 0, "ERROR: MacOS X route delete -inet6 command failed");
2540
2541 #elif defined(TARGET_OPENBSD)
2542
2543 argv_printf(&argv, "%s delete -inet6 %s -prefixlen %d %s",
2544 ROUTE_PATH,
2545 network, r6->netbits, gateway );
2546
2547 argv_msg(D_ROUTE, &argv);
2548 openvpn_execve_check(&argv, es, 0, "ERROR: OpenBSD route delete -inet6 command failed");
2549
2550 #elif defined(TARGET_NETBSD)
2551
2552 argv_printf(&argv, "%s delete -inet6 %s/%d %s",
2553 ROUTE_PATH,
2554 network, r6->netbits, gateway );
2555
2556 argv_msg(D_ROUTE, &argv);
2557 openvpn_execve_check(&argv, es, 0, "ERROR: NetBSD route delete -inet6 command failed");
2558
2559 #elif defined(TARGET_AIX)
2560
2561 argv_printf(&argv, "%s delete -inet6 %s/%d %s",
2562 ROUTE_PATH,
2563 network, r6->netbits, gateway);
2564 argv_msg(D_ROUTE, &argv);
2565 openvpn_execve_check(&argv, es, 0, "ERROR: AIX route add command failed");
2566
2567 #else /* if defined(TARGET_LINUX) */
2568 msg(M_FATAL, "Sorry, but I don't know how to do 'route ipv6' commands on this operating system. Try putting your routes in a --route-down script");
2569 #endif /* if defined(TARGET_LINUX) */
2570
2571 argv_free(&argv);
2572 gc_free(&gc);
2573 /* release resources potentially allocated during route cleanup */
2574 net_ctx_reset(ctx);
2575 }
2576
2577 /*
2578 * The --redirect-gateway option requires OS-specific code below
2579 * to get the current default gateway.
2580 */
2581
2582 #if defined(_WIN32)
2583
2584 static const MIB_IPFORWARDTABLE *
get_windows_routing_table(struct gc_arena * gc)2585 get_windows_routing_table(struct gc_arena *gc)
2586 {
2587 ULONG size = 0;
2588 PMIB_IPFORWARDTABLE rt = NULL;
2589 DWORD status;
2590
2591 status = GetIpForwardTable(NULL, &size, TRUE);
2592 if (status == ERROR_INSUFFICIENT_BUFFER)
2593 {
2594 rt = (PMIB_IPFORWARDTABLE) gc_malloc(size, false, gc);
2595 status = GetIpForwardTable(rt, &size, TRUE);
2596 if (status != NO_ERROR)
2597 {
2598 msg(D_ROUTE, "NOTE: GetIpForwardTable returned error: %s (code=%u)",
2599 strerror_win32(status, gc),
2600 (unsigned int)status);
2601 rt = NULL;
2602 }
2603 }
2604 return rt;
2605 }
2606
2607 static int
test_route(const IP_ADAPTER_INFO * adapters,const in_addr_t gateway,DWORD * index)2608 test_route(const IP_ADAPTER_INFO *adapters,
2609 const in_addr_t gateway,
2610 DWORD *index)
2611 {
2612 int count = 0;
2613 DWORD i = adapter_index_of_ip(adapters, gateway, &count, NULL);
2614 if (index)
2615 {
2616 *index = i;
2617 }
2618 return count;
2619 }
2620
2621 static void
test_route_helper(bool * ret,int * count,int * good,int * ambig,const IP_ADAPTER_INFO * adapters,const in_addr_t gateway)2622 test_route_helper(bool *ret,
2623 int *count,
2624 int *good,
2625 int *ambig,
2626 const IP_ADAPTER_INFO *adapters,
2627 const in_addr_t gateway)
2628 {
2629 int c;
2630
2631 ++*count;
2632 c = test_route(adapters, gateway, NULL);
2633 if (c == 0)
2634 {
2635 *ret = false;
2636 }
2637 else
2638 {
2639 ++*good;
2640 }
2641 if (c > 1)
2642 {
2643 ++*ambig;
2644 }
2645 }
2646
2647 /*
2648 * If we tried to add routes now, would we succeed?
2649 */
2650 bool
test_routes(const struct route_list * rl,const struct tuntap * tt)2651 test_routes(const struct route_list *rl, const struct tuntap *tt)
2652 {
2653 struct gc_arena gc = gc_new();
2654 const IP_ADAPTER_INFO *adapters = get_adapter_info_list(&gc);
2655 bool ret = false;
2656 int count = 0;
2657 int good = 0;
2658 int ambig = 0;
2659 int len = -1;
2660 bool adapter_up = false;
2661
2662 if (is_adapter_up(tt, adapters))
2663 {
2664 ret = true;
2665 adapter_up = true;
2666
2667 /* we do this test only if we have IPv4 routes to install, and if
2668 * the tun/tap interface has seen IPv4 ifconfig - because if we
2669 * have no IPv4, the check will always fail, failing tun init
2670 */
2671 if (rl && tt->did_ifconfig_setup)
2672 {
2673 struct route_ipv4 *r;
2674 for (r = rl->routes, len = 0; r; r = r->next, ++len)
2675 {
2676 test_route_helper(&ret, &count, &good, &ambig, adapters, r->gateway);
2677 }
2678
2679 if ((rl->flags & RG_ENABLE) && (rl->spec.flags & RTSA_REMOTE_ENDPOINT))
2680 {
2681 test_route_helper(&ret, &count, &good, &ambig, adapters, rl->spec.remote_endpoint);
2682 }
2683 }
2684 }
2685
2686 msg(D_ROUTE, "TEST ROUTES: %d/%d succeeded len=%d ret=%d a=%d u/d=%s",
2687 good,
2688 count,
2689 len,
2690 (int)ret,
2691 ambig,
2692 adapter_up ? "up" : "down");
2693
2694 gc_free(&gc);
2695 return ret;
2696 }
2697
2698 static const MIB_IPFORWARDROW *
get_default_gateway_row(const MIB_IPFORWARDTABLE * routes)2699 get_default_gateway_row(const MIB_IPFORWARDTABLE *routes)
2700 {
2701 struct gc_arena gc = gc_new();
2702 DWORD lowest_metric = MAXDWORD;
2703 const MIB_IPFORWARDROW *ret = NULL;
2704 int best = -1;
2705
2706 if (routes)
2707 {
2708 for (DWORD i = 0; i < routes->dwNumEntries; ++i)
2709 {
2710 const MIB_IPFORWARDROW *row = &routes->table[i];
2711 const in_addr_t net = ntohl(row->dwForwardDest);
2712 const in_addr_t mask = ntohl(row->dwForwardMask);
2713 const DWORD index = row->dwForwardIfIndex;
2714 const DWORD metric = row->dwForwardMetric1;
2715
2716 dmsg(D_ROUTE_DEBUG, "GDGR: route[%lu] %s/%s i=%d m=%d",
2717 i,
2718 print_in_addr_t((in_addr_t) net, 0, &gc),
2719 print_in_addr_t((in_addr_t) mask, 0, &gc),
2720 (int)index,
2721 (int)metric);
2722
2723 if (!net && !mask && metric < lowest_metric)
2724 {
2725 ret = row;
2726 lowest_metric = metric;
2727 best = i;
2728 }
2729 }
2730 }
2731
2732 dmsg(D_ROUTE_DEBUG, "GDGR: best=%d lm=%u", best, (unsigned int)lowest_metric);
2733
2734 gc_free(&gc);
2735 return ret;
2736 }
2737
2738 void
get_default_gateway(struct route_gateway_info * rgi,openvpn_net_ctx_t * ctx)2739 get_default_gateway(struct route_gateway_info *rgi, openvpn_net_ctx_t *ctx)
2740 {
2741 struct gc_arena gc = gc_new();
2742
2743 const IP_ADAPTER_INFO *adapters = get_adapter_info_list(&gc);
2744 const MIB_IPFORWARDTABLE *routes = get_windows_routing_table(&gc);
2745 const MIB_IPFORWARDROW *row = get_default_gateway_row(routes);
2746 DWORD a_index;
2747 const IP_ADAPTER_INFO *ai;
2748
2749 CLEAR(*rgi);
2750
2751 if (row)
2752 {
2753 rgi->gateway.addr = ntohl(row->dwForwardNextHop);
2754 if (rgi->gateway.addr)
2755 {
2756 rgi->flags |= RGI_ADDR_DEFINED;
2757 a_index = adapter_index_of_ip(adapters, rgi->gateway.addr, NULL, &rgi->gateway.netmask);
2758 if (a_index != TUN_ADAPTER_INDEX_INVALID)
2759 {
2760 rgi->adapter_index = a_index;
2761 rgi->flags |= (RGI_IFACE_DEFINED|RGI_NETMASK_DEFINED);
2762 ai = get_adapter(adapters, a_index);
2763 if (ai)
2764 {
2765 memcpy(rgi->hwaddr, ai->Address, 6);
2766 rgi->flags |= RGI_HWADDR_DEFINED;
2767 }
2768 }
2769 }
2770 }
2771
2772 gc_free(&gc);
2773 }
2774
2775 static DWORD
windows_route_find_if_index(const struct route_ipv4 * r,const struct tuntap * tt)2776 windows_route_find_if_index(const struct route_ipv4 *r, const struct tuntap *tt)
2777 {
2778 struct gc_arena gc = gc_new();
2779 DWORD ret = TUN_ADAPTER_INDEX_INVALID;
2780 int count = 0;
2781 const IP_ADAPTER_INFO *adapters = get_adapter_info_list(&gc);
2782 const IP_ADAPTER_INFO *tun_adapter = get_tun_adapter(tt, adapters);
2783 bool on_tun = false;
2784
2785 /* first test on tun interface */
2786 if (is_ip_in_adapter_subnet(tun_adapter, r->gateway, NULL))
2787 {
2788 ret = tun_adapter->Index;
2789 count = 1;
2790 on_tun = true;
2791 }
2792 else /* test on other interfaces */
2793 {
2794 count = test_route(adapters, r->gateway, &ret);
2795 }
2796
2797 if (count == 0)
2798 {
2799 msg(M_WARN, "Warning: route gateway is not reachable on any active network adapters: %s",
2800 print_in_addr_t(r->gateway, 0, &gc));
2801 ret = TUN_ADAPTER_INDEX_INVALID;
2802 }
2803 else if (count > 1)
2804 {
2805 msg(M_WARN, "Warning: route gateway is ambiguous: %s (%d matches)",
2806 print_in_addr_t(r->gateway, 0, &gc),
2807 count);
2808 }
2809
2810 dmsg(D_ROUTE_DEBUG, "DEBUG: route find if: on_tun=%d count=%d index=%d",
2811 on_tun,
2812 count,
2813 (int)ret);
2814
2815 gc_free(&gc);
2816 return ret;
2817 }
2818
2819 /* IPv6 implementation using GetBestRoute2()
2820 * (TBD: dynamic linking so the binary can still run on XP?)
2821 * https://msdn.microsoft.com/en-us/library/windows/desktop/aa365922(v=vs.85).aspx
2822 * https://msdn.microsoft.com/en-us/library/windows/desktop/aa814411(v=vs.85).aspx
2823 */
2824 void
get_default_gateway_ipv6(struct route_ipv6_gateway_info * rgi6,const struct in6_addr * dest,openvpn_net_ctx_t * ctx)2825 get_default_gateway_ipv6(struct route_ipv6_gateway_info *rgi6,
2826 const struct in6_addr *dest, openvpn_net_ctx_t *ctx)
2827 {
2828 struct gc_arena gc = gc_new();
2829 MIB_IPFORWARD_ROW2 BestRoute;
2830 SOCKADDR_INET DestinationAddress, BestSourceAddress;
2831 DWORD BestIfIndex;
2832 DWORD status;
2833 NET_LUID InterfaceLuid;
2834
2835 CLEAR(*rgi6);
2836 CLEAR(InterfaceLuid); /* cleared = not used for lookup */
2837 CLEAR(DestinationAddress);
2838
2839 DestinationAddress.si_family = AF_INET6;
2840 if (dest)
2841 {
2842 DestinationAddress.Ipv6.sin6_addr = *dest;
2843 }
2844
2845 status = GetBestInterfaceEx( (struct sockaddr *)&DestinationAddress, &BestIfIndex );
2846
2847 if (status != NO_ERROR)
2848 {
2849 msg(D_ROUTE, "NOTE: GetBestInterfaceEx returned error: %s (code=%u)",
2850 strerror_win32(status, &gc),
2851 (unsigned int)status);
2852 goto done;
2853 }
2854
2855 msg( D_ROUTE, "GetBestInterfaceEx() returned if=%d", (int) BestIfIndex );
2856
2857 status = GetBestRoute2( &InterfaceLuid, BestIfIndex, NULL,
2858 &DestinationAddress, 0,
2859 &BestRoute, &BestSourceAddress );
2860
2861 if (status != NO_ERROR)
2862 {
2863 msg(D_ROUTE, "NOTE: GetIpForwardEntry2 returned error: %s (code=%u)",
2864 strerror_win32(status, &gc),
2865 (unsigned int)status);
2866 goto done;
2867 }
2868
2869 msg( D_ROUTE, "GDG6: II=%lu DP=%s/%d NH=%s",
2870 BestRoute.InterfaceIndex,
2871 print_in6_addr( BestRoute.DestinationPrefix.Prefix.Ipv6.sin6_addr, 0, &gc),
2872 BestRoute.DestinationPrefix.PrefixLength,
2873 print_in6_addr( BestRoute.NextHop.Ipv6.sin6_addr, 0, &gc) );
2874 msg( D_ROUTE, "GDG6: Metric=%d, Loopback=%d, AA=%d, I=%d",
2875 (int) BestRoute.Metric,
2876 (int) BestRoute.Loopback,
2877 (int) BestRoute.AutoconfigureAddress,
2878 (int) BestRoute.Immortal );
2879
2880 rgi6->gateway.addr_ipv6 = BestRoute.NextHop.Ipv6.sin6_addr;
2881 rgi6->adapter_index = BestRoute.InterfaceIndex;
2882 rgi6->flags |= RGI_ADDR_DEFINED | RGI_IFACE_DEFINED;
2883
2884 /* on-link is signalled by receiving an empty (::) NextHop */
2885 if (IN6_IS_ADDR_UNSPECIFIED(&BestRoute.NextHop.Ipv6.sin6_addr) )
2886 {
2887 rgi6->flags |= RGI_ON_LINK;
2888 }
2889
2890 done:
2891 gc_free(&gc);
2892 }
2893
2894 bool
add_route_ipapi(const struct route_ipv4 * r,const struct tuntap * tt,DWORD adapter_index)2895 add_route_ipapi(const struct route_ipv4 *r, const struct tuntap *tt, DWORD adapter_index)
2896 {
2897 struct gc_arena gc = gc_new();
2898 bool ret = false;
2899 DWORD status;
2900 const DWORD if_index = (adapter_index == TUN_ADAPTER_INDEX_INVALID) ? windows_route_find_if_index(r, tt) : adapter_index;
2901
2902 if (if_index != TUN_ADAPTER_INDEX_INVALID)
2903 {
2904 MIB_IPFORWARDROW fr;
2905 CLEAR(fr);
2906 fr.dwForwardDest = htonl(r->network);
2907 fr.dwForwardMask = htonl(r->netmask);
2908 fr.dwForwardPolicy = 0;
2909 fr.dwForwardNextHop = htonl(r->gateway);
2910 fr.dwForwardIfIndex = if_index;
2911 fr.dwForwardType = 4; /* the next hop is not the final dest */
2912 fr.dwForwardProto = 3; /* PROTO_IP_NETMGMT */
2913 fr.dwForwardAge = 0;
2914 fr.dwForwardNextHopAS = 0;
2915 fr.dwForwardMetric1 = (r->flags & RT_METRIC_DEFINED) ? r->metric : 1;
2916 fr.dwForwardMetric2 = METRIC_NOT_USED;
2917 fr.dwForwardMetric3 = METRIC_NOT_USED;
2918 fr.dwForwardMetric4 = METRIC_NOT_USED;
2919 fr.dwForwardMetric5 = METRIC_NOT_USED;
2920
2921 if ((r->network & r->netmask) != r->network)
2922 {
2923 msg(M_WARN, "Warning: address %s is not a network address in relation to netmask %s",
2924 print_in_addr_t(r->network, 0, &gc),
2925 print_in_addr_t(r->netmask, 0, &gc));
2926 }
2927
2928 status = CreateIpForwardEntry(&fr);
2929
2930 if (status == NO_ERROR)
2931 {
2932 ret = true;
2933 }
2934 else
2935 {
2936 /* failed, try increasing the metric to work around Vista issue */
2937 const unsigned int forward_metric_limit = 2048; /* iteratively retry higher metrics up to this limit */
2938
2939 for (; fr.dwForwardMetric1 <= forward_metric_limit; ++fr.dwForwardMetric1)
2940 {
2941 /* try a different forward type=3 ("the next hop is the final dest") in addition to 4.
2942 * --redirect-gateway over RRAS seems to need this. */
2943 for (fr.dwForwardType = 4; fr.dwForwardType >= 3; --fr.dwForwardType)
2944 {
2945 status = CreateIpForwardEntry(&fr);
2946 if (status == NO_ERROR)
2947 {
2948 msg(D_ROUTE, "ROUTE: CreateIpForwardEntry succeeded with dwForwardMetric1=%u and dwForwardType=%u",
2949 (unsigned int)fr.dwForwardMetric1,
2950 (unsigned int)fr.dwForwardType);
2951 ret = true;
2952 goto doublebreak;
2953 }
2954 else if (status != ERROR_BAD_ARGUMENTS)
2955 {
2956 goto doublebreak;
2957 }
2958 }
2959 }
2960
2961 doublebreak:
2962 if (status != NO_ERROR)
2963 {
2964 msg(M_WARN, "ROUTE: route addition failed using CreateIpForwardEntry: %s [status=%u if_index=%u]",
2965 strerror_win32(status, &gc),
2966 (unsigned int)status,
2967 (unsigned int)if_index);
2968 }
2969 }
2970 }
2971
2972 gc_free(&gc);
2973 return ret;
2974 }
2975
2976 bool
del_route_ipapi(const struct route_ipv4 * r,const struct tuntap * tt)2977 del_route_ipapi(const struct route_ipv4 *r, const struct tuntap *tt)
2978 {
2979 struct gc_arena gc = gc_new();
2980 bool ret = false;
2981 DWORD status;
2982 const DWORD if_index = windows_route_find_if_index(r, tt);
2983
2984 if (if_index != TUN_ADAPTER_INDEX_INVALID)
2985 {
2986 MIB_IPFORWARDROW fr;
2987 CLEAR(fr);
2988
2989 fr.dwForwardDest = htonl(r->network);
2990 fr.dwForwardMask = htonl(r->netmask);
2991 fr.dwForwardPolicy = 0;
2992 fr.dwForwardNextHop = htonl(r->gateway);
2993 fr.dwForwardIfIndex = if_index;
2994
2995 status = DeleteIpForwardEntry(&fr);
2996
2997 if (status == NO_ERROR)
2998 {
2999 ret = true;
3000 }
3001 else
3002 {
3003 msg(M_WARN, "ROUTE: route deletion failed using DeleteIpForwardEntry: %s",
3004 strerror_win32(status, &gc));
3005 }
3006 }
3007
3008 gc_free(&gc);
3009 return ret;
3010 }
3011
3012 static bool
do_route_service(const bool add,const route_message_t * rt,const size_t size,HANDLE pipe)3013 do_route_service(const bool add, const route_message_t *rt, const size_t size, HANDLE pipe)
3014 {
3015 bool ret = false;
3016 ack_message_t ack;
3017 struct gc_arena gc = gc_new();
3018
3019 if (!send_msg_iservice(pipe, rt, size, &ack, "ROUTE"))
3020 {
3021 goto out;
3022 }
3023
3024 if (ack.error_number != NO_ERROR)
3025 {
3026 msg(M_WARN, "ROUTE: route %s failed using service: %s [status=%u if_index=%d]",
3027 (add ? "addition" : "deletion"), strerror_win32(ack.error_number, &gc),
3028 ack.error_number, rt->iface.index);
3029 goto out;
3030 }
3031
3032 ret = true;
3033
3034 out:
3035 gc_free(&gc);
3036 return ret;
3037 }
3038
3039 static bool
do_route_ipv4_service(const bool add,const struct route_ipv4 * r,const struct tuntap * tt)3040 do_route_ipv4_service(const bool add, const struct route_ipv4 *r, const struct tuntap *tt)
3041 {
3042 DWORD if_index = windows_route_find_if_index(r, tt);
3043 if (if_index == ~0)
3044 {
3045 return false;
3046 }
3047
3048 route_message_t msg = {
3049 .header = {
3050 (add ? msg_add_route : msg_del_route),
3051 sizeof(route_message_t),
3052 0
3053 },
3054 .family = AF_INET,
3055 .prefix.ipv4.s_addr = htonl(r->network),
3056 .gateway.ipv4.s_addr = htonl(r->gateway),
3057 .iface = { .index = if_index, .name = "" },
3058 .metric = (r->flags & RT_METRIC_DEFINED ? r->metric : -1)
3059 };
3060
3061 netmask_to_netbits(r->network, r->netmask, &msg.prefix_len);
3062 if (msg.prefix_len == -1)
3063 {
3064 msg.prefix_len = 32;
3065 }
3066
3067 return do_route_service(add, &msg, sizeof(msg), tt->options.msg_channel);
3068 }
3069
3070 static bool
do_route_ipv6_service(const bool add,const struct route_ipv6 * r,const struct tuntap * tt)3071 do_route_ipv6_service(const bool add, const struct route_ipv6 *r, const struct tuntap *tt)
3072 {
3073 bool status;
3074 route_message_t msg = {
3075 .header = {
3076 (add ? msg_add_route : msg_del_route),
3077 sizeof(route_message_t),
3078 0
3079 },
3080 .family = AF_INET6,
3081 .prefix.ipv6 = r->network,
3082 .prefix_len = r->netbits,
3083 .gateway.ipv6 = r->gateway,
3084 .iface = { .index = tt->adapter_index, .name = "" },
3085 .metric = ( (r->flags & RT_METRIC_DEFINED) ? r->metric : -1)
3086 };
3087
3088 if (r->adapter_index) /* vpn server special route */
3089 {
3090 msg.iface.index = r->adapter_index;
3091 }
3092
3093 /* In TUN mode we use a special link-local address as the next hop.
3094 * The tapdrvr knows about it and will answer neighbor discovery packets.
3095 * (only do this for routes actually using the tun/tap device)
3096 */
3097 if (tt->type == DEV_TYPE_TUN
3098 && msg.iface.index == tt->adapter_index)
3099 {
3100 inet_pton(AF_INET6, "fe80::8", &msg.gateway.ipv6);
3101 }
3102
3103 if (msg.iface.index == TUN_ADAPTER_INDEX_INVALID)
3104 {
3105 strncpy(msg.iface.name, tt->actual_name, sizeof(msg.iface.name));
3106 msg.iface.name[sizeof(msg.iface.name) - 1] = '\0';
3107 }
3108
3109 status = do_route_service(add, &msg, sizeof(msg), tt->options.msg_channel);
3110 msg(D_ROUTE, "IPv6 route %s via service %s",
3111 add ? "addition" : "deletion",
3112 status ? "succeeded" : "failed");
3113 return status;
3114 }
3115
3116 static bool
add_route_service(const struct route_ipv4 * r,const struct tuntap * tt)3117 add_route_service(const struct route_ipv4 *r, const struct tuntap *tt)
3118 {
3119 return do_route_ipv4_service(true, r, tt);
3120 }
3121
3122 static bool
del_route_service(const struct route_ipv4 * r,const struct tuntap * tt)3123 del_route_service(const struct route_ipv4 *r, const struct tuntap *tt)
3124 {
3125 return do_route_ipv4_service(false, r, tt);
3126 }
3127
3128 static bool
add_route_ipv6_service(const struct route_ipv6 * r,const struct tuntap * tt)3129 add_route_ipv6_service(const struct route_ipv6 *r, const struct tuntap *tt)
3130 {
3131 return do_route_ipv6_service(true, r, tt);
3132 }
3133
3134 static bool
del_route_ipv6_service(const struct route_ipv6 * r,const struct tuntap * tt)3135 del_route_ipv6_service(const struct route_ipv6 *r, const struct tuntap *tt)
3136 {
3137 return do_route_ipv6_service(false, r, tt);
3138 }
3139
3140 static const char *
format_route_entry(const MIB_IPFORWARDROW * r,struct gc_arena * gc)3141 format_route_entry(const MIB_IPFORWARDROW *r, struct gc_arena *gc)
3142 {
3143 struct buffer out = alloc_buf_gc(256, gc);
3144 buf_printf(&out, "%s %s %s p=%d i=%d t=%d pr=%d a=%d h=%d m=%d/%d/%d/%d/%d",
3145 print_in_addr_t(r->dwForwardDest, IA_NET_ORDER, gc),
3146 print_in_addr_t(r->dwForwardMask, IA_NET_ORDER, gc),
3147 print_in_addr_t(r->dwForwardNextHop, IA_NET_ORDER, gc),
3148 (int)r->dwForwardPolicy,
3149 (int)r->dwForwardIfIndex,
3150 (int)r->dwForwardType,
3151 (int)r->dwForwardProto,
3152 (int)r->dwForwardAge,
3153 (int)r->dwForwardNextHopAS,
3154 (int)r->dwForwardMetric1,
3155 (int)r->dwForwardMetric2,
3156 (int)r->dwForwardMetric3,
3157 (int)r->dwForwardMetric4,
3158 (int)r->dwForwardMetric5);
3159 return BSTR(&out);
3160 }
3161
3162 /*
3163 * Show current routing table
3164 */
3165 void
show_routes(int msglev)3166 show_routes(int msglev)
3167 {
3168 struct gc_arena gc = gc_new();
3169
3170 const MIB_IPFORWARDTABLE *rt = get_windows_routing_table(&gc);
3171
3172 msg(msglev, "SYSTEM ROUTING TABLE");
3173 if (rt)
3174 {
3175 for (DWORD i = 0; i < rt->dwNumEntries; ++i)
3176 {
3177 msg(msglev, "%s", format_route_entry(&rt->table[i], &gc));
3178 }
3179 }
3180 gc_free(&gc);
3181 }
3182
3183 #elif defined(TARGET_ANDROID)
3184
3185 void
get_default_gateway(struct route_gateway_info * rgi,openvpn_net_ctx_t * ctx)3186 get_default_gateway(struct route_gateway_info *rgi, openvpn_net_ctx_t *ctx)
3187 {
3188 /* Android, set some pseudo GW, addr is in host byte order,
3189 * Determining the default GW on Android 5.0+ is non trivial
3190 * and serves almost no purpose since OpenVPN only uses the
3191 * default GW address to add routes for networks that should
3192 * NOT be routed over the VPN. Using a well known address
3193 * (127.'d'.'g'.'w') for the default GW make detecting
3194 * these routes easier from the controlling app.
3195 */
3196 CLEAR(*rgi);
3197
3198 rgi->gateway.addr = 127 << 24 | 'd' << 16 | 'g' << 8 | 'w';
3199 rgi->flags = RGI_ADDR_DEFINED | RGI_IFACE_DEFINED;
3200 strcpy(rgi->iface, "android-gw");
3201
3202 /* Skip scanning/fetching interface from loopback interface we do
3203 * normally on Linux.
3204 * It always fails and "ioctl(SIOCGIFCONF) failed" confuses users
3205 */
3206
3207 }
3208
3209 void
get_default_gateway_ipv6(struct route_ipv6_gateway_info * rgi6,const struct in6_addr * dest,openvpn_net_ctx_t * ctx)3210 get_default_gateway_ipv6(struct route_ipv6_gateway_info *rgi6,
3211 const struct in6_addr *dest, openvpn_net_ctx_t *ctx)
3212 {
3213 /* Same for ipv6 */
3214
3215 CLEAR(*rgi6);
3216
3217 /* Use a fake link-local address */
3218 ASSERT(inet_pton(AF_INET6, "fe80::ad", &rgi6->addrs->addr_ipv6) == 1);
3219 rgi6->addrs->netbits_ipv6 = 64;
3220 rgi6->flags = RGI_ADDR_DEFINED | RGI_IFACE_DEFINED;
3221 strcpy(rgi6->iface, "android-gw");
3222 }
3223
3224 #elif defined(TARGET_LINUX)
3225
3226 void
get_default_gateway(struct route_gateway_info * rgi,openvpn_net_ctx_t * ctx)3227 get_default_gateway(struct route_gateway_info *rgi, openvpn_net_ctx_t *ctx)
3228 {
3229 struct gc_arena gc = gc_new();
3230 int sd = -1;
3231 char best_name[IFNAMSIZ];
3232
3233 CLEAR(*rgi);
3234 CLEAR(best_name);
3235
3236 /* get default gateway IP addr */
3237 if (net_route_v4_best_gw(ctx, NULL, &rgi->gateway.addr, best_name) == 0)
3238 {
3239 rgi->flags |= RGI_ADDR_DEFINED;
3240 if (!rgi->gateway.addr && best_name[0])
3241 {
3242 rgi->flags |= RGI_ON_LINK;
3243 }
3244 }
3245
3246 /* scan adapter list */
3247 if (rgi->flags & RGI_ADDR_DEFINED)
3248 {
3249 struct ifreq *ifr, *ifend;
3250 in_addr_t addr, netmask;
3251 struct ifreq ifreq;
3252 struct ifconf ifc;
3253 struct ifreq ifs[20]; /* Maximum number of interfaces to scan */
3254
3255 if ((sd = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
3256 {
3257 msg(M_WARN, "GDG: socket() failed");
3258 goto done;
3259 }
3260 ifc.ifc_len = sizeof(ifs);
3261 ifc.ifc_req = ifs;
3262 if (ioctl(sd, SIOCGIFCONF, &ifc) < 0)
3263 {
3264 msg(M_WARN, "GDG: ioctl(SIOCGIFCONF) failed");
3265 goto done;
3266 }
3267
3268 /* scan through interface list */
3269 ifend = ifs + (ifc.ifc_len / sizeof(struct ifreq));
3270 for (ifr = ifc.ifc_req; ifr < ifend; ifr++)
3271 {
3272 if (ifr->ifr_addr.sa_family == AF_INET)
3273 {
3274 /* get interface addr */
3275 addr = ntohl(((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr);
3276
3277 /* get interface name */
3278 strncpynt(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
3279
3280 /* check that the interface is up */
3281 if (ioctl(sd, SIOCGIFFLAGS, &ifreq) < 0)
3282 {
3283 continue;
3284 }
3285 if (!(ifreq.ifr_flags & IFF_UP))
3286 {
3287 continue;
3288 }
3289
3290 if (rgi->flags & RGI_ON_LINK)
3291 {
3292 /* check that interface name of current interface
3293 * matches interface name of best default route */
3294 if (strcmp(ifreq.ifr_name, best_name))
3295 {
3296 continue;
3297 }
3298 #if 0
3299 /* if point-to-point link, use remote addr as route gateway */
3300 if ((ifreq.ifr_flags & IFF_POINTOPOINT) && ioctl(sd, SIOCGIFDSTADDR, &ifreq) >= 0)
3301 {
3302 rgi->gateway.addr = ntohl(((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr);
3303 if (rgi->gateway.addr)
3304 {
3305 rgi->flags &= ~RGI_ON_LINK;
3306 }
3307 }
3308 #endif
3309 }
3310 else
3311 {
3312 /* get interface netmask */
3313 if (ioctl(sd, SIOCGIFNETMASK, &ifreq) < 0)
3314 {
3315 continue;
3316 }
3317 netmask = ntohl(((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr);
3318
3319 /* check that interface matches default route */
3320 if (((rgi->gateway.addr ^ addr) & netmask) != 0)
3321 {
3322 continue;
3323 }
3324
3325 /* save netmask */
3326 rgi->gateway.netmask = netmask;
3327 rgi->flags |= RGI_NETMASK_DEFINED;
3328 }
3329
3330 /* save iface name */
3331 strncpynt(rgi->iface, ifreq.ifr_name, sizeof(rgi->iface));
3332 rgi->flags |= RGI_IFACE_DEFINED;
3333
3334 /* now get the hardware address. */
3335 memset(&ifreq.ifr_hwaddr, 0, sizeof(struct sockaddr));
3336 if (ioctl(sd, SIOCGIFHWADDR, &ifreq) < 0)
3337 {
3338 msg(M_WARN, "GDG: SIOCGIFHWADDR(%s) failed", ifreq.ifr_name);
3339 goto done;
3340 }
3341 memcpy(rgi->hwaddr, &ifreq.ifr_hwaddr.sa_data, 6);
3342 rgi->flags |= RGI_HWADDR_DEFINED;
3343
3344 break;
3345 }
3346 }
3347 }
3348
3349 done:
3350 if (sd >= 0)
3351 {
3352 close(sd);
3353 }
3354 gc_free(&gc);
3355 }
3356
3357 /* IPv6 implementation using netlink
3358 * http://www.linuxjournal.com/article/7356
3359 * netlink(3), netlink(7), rtnetlink(7)
3360 * http://www.virtualbox.org/svn/vbox/trunk/src/VBox/NetworkServices/NAT/rtmon_linux.c
3361 */
3362 struct rtreq {
3363 struct nlmsghdr nh;
3364 struct rtmsg rtm;
3365 char attrbuf[512];
3366 };
3367
3368 void
get_default_gateway_ipv6(struct route_ipv6_gateway_info * rgi6,const struct in6_addr * dest,openvpn_net_ctx_t * ctx)3369 get_default_gateway_ipv6(struct route_ipv6_gateway_info *rgi6,
3370 const struct in6_addr *dest, openvpn_net_ctx_t *ctx)
3371 {
3372 int flags;
3373
3374 CLEAR(*rgi6);
3375
3376 if (net_route_v6_best_gw(ctx, dest, &rgi6->gateway.addr_ipv6,
3377 rgi6->iface) == 0)
3378 {
3379 if (!IN6_IS_ADDR_UNSPECIFIED(rgi6->gateway.addr_ipv6.s6_addr))
3380 {
3381 rgi6->flags |= RGI_ADDR_DEFINED;
3382 }
3383
3384 if (strlen(rgi6->iface) > 0)
3385 {
3386 rgi6->flags |= RGI_IFACE_DEFINED;
3387 }
3388 }
3389
3390 /* if we have an interface but no gateway, the destination is on-link */
3391 flags = rgi6->flags & (RGI_IFACE_DEFINED | RGI_ADDR_DEFINED);
3392 if (flags == RGI_IFACE_DEFINED)
3393 {
3394 rgi6->flags |= (RGI_ADDR_DEFINED | RGI_ON_LINK);
3395 if (dest)
3396 {
3397 rgi6->gateway.addr_ipv6 = *dest;
3398 }
3399 }
3400 }
3401
3402 #elif defined(TARGET_DARWIN) || defined(TARGET_SOLARIS) \
3403 || defined(TARGET_FREEBSD) || defined(TARGET_DRAGONFLY) \
3404 || defined(TARGET_OPENBSD) || defined(TARGET_NETBSD)
3405
3406 #include <sys/types.h>
3407 #include <sys/socket.h>
3408 #include <netinet/in.h>
3409 #include <net/route.h>
3410 #include <net/if_dl.h>
3411
3412 struct rtmsg {
3413 struct rt_msghdr m_rtm;
3414 char m_space[512];
3415 };
3416
3417 /* the route socket code is identical for all 4 supported BSDs and for
3418 * MacOS X (Darwin), with one crucial difference: when going from
3419 * 32 bit to 64 bit, FreeBSD/OpenBSD increased the structure size but kept
3420 * source code compatibility by keeping the use of "long", while
3421 * MacOS X decided to keep binary compatibility by *changing* the API
3422 * to use "uint32_t", thus 32 bit on all OS X variants
3423 *
3424 * NetBSD does the MacOS way of "fixed number of bits, no matter if
3425 * 32 or 64 bit OS", but chose uint64_t. For maximum portability, we
3426 * just use the OS RT_ROUNDUP() macro, which is guaranteed to be correct.
3427 *
3428 * We used to have a large amount of duplicate code here which really
3429 * differed only in this (long) vs. (uint32_t) - IMHO, worse than
3430 * having a combined block for all BSDs with this single #ifdef inside
3431 */
3432
3433 #if defined(TARGET_DARWIN)
3434 #define ROUNDUP(a) \
3435 ((a) > 0 ? (1 + (((a) - 1) | (sizeof(uint32_t) - 1))) : sizeof(uint32_t))
3436 #elif defined(TARGET_NETBSD)
3437 #define ROUNDUP(a) RT_ROUNDUP(a)
3438 #else
3439 #define ROUNDUP(a) \
3440 ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
3441 #endif
3442
3443 #if defined(TARGET_SOLARIS)
3444 #define NEXTADDR(w, u) \
3445 if (rtm_addrs & (w)) { \
3446 l = sizeof(u); memmove(cp, &(u), l); cp += ROUNDUP(l); \
3447 }
3448
3449 #define ADVANCE(x, n) (x += ROUNDUP(sizeof(struct sockaddr_in)))
3450 #else /* if defined(TARGET_SOLARIS) */
3451 #define NEXTADDR(w, u) \
3452 if (rtm_addrs & (w)) { \
3453 l = ((struct sockaddr *)&(u))->sa_len; memmove(cp, &(u), l); cp += ROUNDUP(l); \
3454 }
3455
3456 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
3457 #endif
3458
3459 #define max(a,b) ((a) > (b) ? (a) : (b))
3460
3461 void
get_default_gateway(struct route_gateway_info * rgi,openvpn_net_ctx_t * ctx)3462 get_default_gateway(struct route_gateway_info *rgi, openvpn_net_ctx_t *ctx)
3463 {
3464 struct gc_arena gc = gc_new();
3465 struct rtmsg m_rtmsg;
3466 int sockfd = -1;
3467 int seq, l, pid, rtm_addrs;
3468 unsigned int i;
3469 struct sockaddr so_dst, so_mask;
3470 char *cp = m_rtmsg.m_space;
3471 struct sockaddr *gate = NULL, *ifp = NULL, *sa;
3472 struct rt_msghdr *rtm_aux;
3473
3474 #define rtm m_rtmsg.m_rtm
3475
3476 CLEAR(*rgi);
3477
3478 /* setup data to send to routing socket */
3479 pid = getpid();
3480 seq = 0;
3481 rtm_addrs = RTA_DST | RTA_NETMASK | RTA_IFP;
3482
3483 bzero(&m_rtmsg, sizeof(m_rtmsg));
3484 bzero(&so_dst, sizeof(so_dst));
3485 bzero(&so_mask, sizeof(so_mask));
3486 bzero(&rtm, sizeof(struct rt_msghdr));
3487
3488 rtm.rtm_type = RTM_GET;
3489 rtm.rtm_flags = RTF_UP | RTF_GATEWAY;
3490 rtm.rtm_version = RTM_VERSION;
3491 rtm.rtm_seq = ++seq;
3492 #ifdef TARGET_OPENBSD
3493 rtm.rtm_tableid = getrtable();
3494 #endif
3495 rtm.rtm_addrs = rtm_addrs;
3496
3497 so_dst.sa_family = AF_INET;
3498 so_mask.sa_family = AF_INET;
3499
3500 #ifndef TARGET_SOLARIS
3501 so_dst.sa_len = sizeof(struct sockaddr_in);
3502 so_mask.sa_len = sizeof(struct sockaddr_in);
3503 #endif
3504
3505 NEXTADDR(RTA_DST, so_dst);
3506 NEXTADDR(RTA_NETMASK, so_mask);
3507
3508 rtm.rtm_msglen = l = cp - (char *)&m_rtmsg;
3509
3510 /* transact with routing socket */
3511 sockfd = socket(PF_ROUTE, SOCK_RAW, 0);
3512 if (sockfd < 0)
3513 {
3514 msg(M_WARN, "GDG: socket #1 failed");
3515 goto done;
3516 }
3517 if (write(sockfd, (char *)&m_rtmsg, l) < 0)
3518 {
3519 msg(M_WARN, "GDG: problem writing to routing socket");
3520 goto done;
3521 }
3522 do
3523 {
3524 l = read(sockfd, (char *)&m_rtmsg, sizeof(m_rtmsg));
3525 } while (l > 0 && (rtm.rtm_seq != seq || rtm.rtm_pid != pid));
3526 close(sockfd);
3527 sockfd = -1;
3528
3529 /* extract return data from routing socket */
3530 rtm_aux = &rtm;
3531 cp = ((char *)(rtm_aux + 1));
3532 if (rtm_aux->rtm_addrs)
3533 {
3534 for (i = 1; i; i <<= 1)
3535 {
3536 if (i & rtm_aux->rtm_addrs)
3537 {
3538 sa = (struct sockaddr *)cp;
3539 if (i == RTA_GATEWAY)
3540 {
3541 gate = sa;
3542 }
3543 else if (i == RTA_IFP)
3544 {
3545 ifp = sa;
3546 }
3547 ADVANCE(cp, sa);
3548 }
3549 }
3550 }
3551 else
3552 {
3553 goto done;
3554 }
3555
3556 /* get gateway addr and interface name */
3557 if (gate != NULL)
3558 {
3559 /* get default gateway addr */
3560 rgi->gateway.addr = ntohl(((struct sockaddr_in *)gate)->sin_addr.s_addr);
3561 if (rgi->gateway.addr)
3562 {
3563 rgi->flags |= RGI_ADDR_DEFINED;
3564 }
3565
3566 if (ifp)
3567 {
3568 /* get interface name */
3569 const struct sockaddr_dl *adl = (struct sockaddr_dl *) ifp;
3570 if (adl->sdl_nlen && adl->sdl_nlen < sizeof(rgi->iface))
3571 {
3572 memcpy(rgi->iface, adl->sdl_data, adl->sdl_nlen);
3573 rgi->iface[adl->sdl_nlen] = '\0';
3574 rgi->flags |= RGI_IFACE_DEFINED;
3575 }
3576 }
3577 }
3578
3579 /* get netmask of interface that owns default gateway */
3580 if (rgi->flags & RGI_IFACE_DEFINED)
3581 {
3582 struct ifreq ifr;
3583
3584 sockfd = socket(AF_INET, SOCK_DGRAM, 0);
3585 if (sockfd < 0)
3586 {
3587 msg(M_WARN, "GDG: socket #2 failed");
3588 goto done;
3589 }
3590
3591 CLEAR(ifr);
3592 ifr.ifr_addr.sa_family = AF_INET;
3593 strncpynt(ifr.ifr_name, rgi->iface, IFNAMSIZ);
3594
3595 if (ioctl(sockfd, SIOCGIFNETMASK, (char *)&ifr) < 0)
3596 {
3597 msg(M_WARN, "GDG: ioctl #1 failed");
3598 goto done;
3599 }
3600 close(sockfd);
3601 sockfd = -1;
3602
3603 rgi->gateway.netmask = ntohl(((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr.s_addr);
3604 rgi->flags |= RGI_NETMASK_DEFINED;
3605 }
3606
3607 /* try to read MAC addr associated with interface that owns default gateway */
3608 if (rgi->flags & RGI_IFACE_DEFINED)
3609 {
3610 struct ifconf ifc;
3611 struct ifreq *ifr;
3612 const int bufsize = 4096;
3613 char *buffer;
3614
3615 buffer = (char *) gc_malloc(bufsize, true, &gc);
3616 sockfd = socket(AF_INET, SOCK_DGRAM, 0);
3617 if (sockfd < 0)
3618 {
3619 msg(M_WARN, "GDG: socket #3 failed");
3620 goto done;
3621 }
3622
3623 ifc.ifc_len = bufsize;
3624 ifc.ifc_buf = buffer;
3625
3626 if (ioctl(sockfd, SIOCGIFCONF, (char *)&ifc) < 0)
3627 {
3628 msg(M_WARN, "GDG: ioctl #2 failed");
3629 goto done;
3630 }
3631 close(sockfd);
3632 sockfd = -1;
3633
3634 for (cp = buffer; cp <= buffer + ifc.ifc_len - sizeof(struct ifreq); )
3635 {
3636 ifr = (struct ifreq *)cp;
3637 #if defined(TARGET_SOLARIS)
3638 const size_t len = sizeof(ifr->ifr_name) + sizeof(ifr->ifr_addr);
3639 #else
3640 const size_t len = sizeof(ifr->ifr_name) + max(sizeof(ifr->ifr_addr), ifr->ifr_addr.sa_len);
3641 #endif
3642
3643 if (!ifr->ifr_addr.sa_family)
3644 {
3645 break;
3646 }
3647 if (!strncmp(ifr->ifr_name, rgi->iface, IFNAMSIZ))
3648 {
3649 if (ifr->ifr_addr.sa_family == AF_LINK)
3650 {
3651 struct sockaddr_dl *sdl = (struct sockaddr_dl *)&ifr->ifr_addr;
3652 memcpy(rgi->hwaddr, LLADDR(sdl), 6);
3653 rgi->flags |= RGI_HWADDR_DEFINED;
3654 }
3655 }
3656 cp += len;
3657 }
3658 }
3659
3660 done:
3661 if (sockfd >= 0)
3662 {
3663 close(sockfd);
3664 }
3665 gc_free(&gc);
3666 }
3667
3668 /* BSD implementation using routing socket (as does IPv4)
3669 * (the code duplication is somewhat unavoidable if we want this to
3670 * work on OpenSolaris as well. *sigh*)
3671 */
3672
3673 /* Solaris has no length field - this is ugly, but less #ifdef in total
3674 */
3675 #if defined(TARGET_SOLARIS)
3676 #undef ADVANCE
3677 #define ADVANCE(x, n) (x += ROUNDUP(sizeof(struct sockaddr_in6)))
3678 #endif
3679
3680 void
get_default_gateway_ipv6(struct route_ipv6_gateway_info * rgi6,const struct in6_addr * dest,openvpn_net_ctx_t * ctx)3681 get_default_gateway_ipv6(struct route_ipv6_gateway_info *rgi6,
3682 const struct in6_addr *dest, openvpn_net_ctx_t *ctx)
3683 {
3684
3685 struct rtmsg m_rtmsg;
3686 int sockfd = -1;
3687 int seq, l, pid, rtm_addrs;
3688 unsigned int i;
3689 struct sockaddr_in6 so_dst, so_mask;
3690 char *cp = m_rtmsg.m_space;
3691 struct sockaddr *gate = NULL, *ifp = NULL, *sa;
3692 struct rt_msghdr *rtm_aux;
3693
3694 CLEAR(*rgi6);
3695
3696 /* setup data to send to routing socket */
3697 pid = getpid();
3698 seq = 0;
3699 rtm_addrs = RTA_DST | RTA_NETMASK | RTA_IFP;
3700
3701 bzero(&m_rtmsg, sizeof(m_rtmsg));
3702 bzero(&so_dst, sizeof(so_dst));
3703 bzero(&so_mask, sizeof(so_mask));
3704 bzero(&rtm, sizeof(struct rt_msghdr));
3705
3706 rtm.rtm_type = RTM_GET;
3707 rtm.rtm_flags = RTF_UP;
3708 rtm.rtm_version = RTM_VERSION;
3709 rtm.rtm_seq = ++seq;
3710 #ifdef TARGET_OPENBSD
3711 rtm.rtm_tableid = getrtable();
3712 #endif
3713
3714 so_dst.sin6_family = AF_INET6;
3715 so_mask.sin6_family = AF_INET6;
3716
3717 if (dest != NULL /* specific host? */
3718 && !IN6_IS_ADDR_UNSPECIFIED(dest) )
3719 {
3720 so_dst.sin6_addr = *dest;
3721 /* :: needs /0 "netmask", host route wants "no netmask */
3722 rtm_addrs &= ~RTA_NETMASK;
3723 }
3724
3725 rtm.rtm_addrs = rtm_addrs;
3726
3727 #ifndef TARGET_SOLARIS
3728 so_dst.sin6_len = sizeof(struct sockaddr_in6);
3729 so_mask.sin6_len = sizeof(struct sockaddr_in6);
3730 #endif
3731
3732 NEXTADDR(RTA_DST, so_dst);
3733 NEXTADDR(RTA_NETMASK, so_mask);
3734
3735 rtm.rtm_msglen = l = cp - (char *)&m_rtmsg;
3736
3737 /* transact with routing socket */
3738 sockfd = socket(PF_ROUTE, SOCK_RAW, 0);
3739 if (sockfd < 0)
3740 {
3741 msg(M_WARN, "GDG6: socket #1 failed");
3742 goto done;
3743 }
3744 if (write(sockfd, (char *)&m_rtmsg, l) < 0)
3745 {
3746 msg(M_WARN|M_ERRNO, "GDG6: problem writing to routing socket");
3747 goto done;
3748 }
3749
3750 do
3751 {
3752 l = read(sockfd, (char *)&m_rtmsg, sizeof(m_rtmsg));
3753 }
3754 while (l > 0 && (rtm.rtm_seq != seq || rtm.rtm_pid != pid));
3755
3756 close(sockfd);
3757 sockfd = -1;
3758
3759 /* extract return data from routing socket */
3760 rtm_aux = &rtm;
3761 cp = ((char *)(rtm_aux + 1));
3762 if (rtm_aux->rtm_addrs)
3763 {
3764 for (i = 1; i; i <<= 1)
3765 {
3766 if (i & rtm_aux->rtm_addrs)
3767 {
3768 sa = (struct sockaddr *)cp;
3769 if (i == RTA_GATEWAY)
3770 {
3771 gate = sa;
3772 }
3773 else if (i == RTA_IFP)
3774 {
3775 ifp = sa;
3776 }
3777 ADVANCE(cp, sa);
3778 }
3779 }
3780 }
3781 else
3782 {
3783 goto done;
3784 }
3785
3786 /* get gateway addr and interface name */
3787 if (gate != NULL)
3788 {
3789 struct sockaddr_in6 *s6 = (struct sockaddr_in6 *)gate;
3790 struct in6_addr gw = s6->sin6_addr;
3791
3792 #ifndef TARGET_SOLARIS
3793 /* You do not really want to know... from FreeBSD's route.c
3794 * (KAME encodes the 16 bit scope_id in s6_addr[2] + [3],
3795 * but for a correct link-local address these must be :0000: )
3796 */
3797 if (gate->sa_len == sizeof(struct sockaddr_in6)
3798 && IN6_IS_ADDR_LINKLOCAL(&gw) )
3799 {
3800 gw.s6_addr[2] = gw.s6_addr[3] = 0;
3801 }
3802
3803 if (gate->sa_len != sizeof(struct sockaddr_in6)
3804 || IN6_IS_ADDR_UNSPECIFIED(&gw) )
3805 {
3806 rgi6->flags |= RGI_ON_LINK;
3807 }
3808 else
3809 #endif
3810
3811 rgi6->gateway.addr_ipv6 = gw;
3812 rgi6->flags |= RGI_ADDR_DEFINED;
3813
3814 if (ifp)
3815 {
3816 /* get interface name */
3817 const struct sockaddr_dl *adl = (struct sockaddr_dl *) ifp;
3818 if (adl->sdl_nlen && adl->sdl_nlen < sizeof(rgi6->iface))
3819 {
3820 memcpy(rgi6->iface, adl->sdl_data, adl->sdl_nlen);
3821 rgi6->flags |= RGI_IFACE_DEFINED;
3822 }
3823 }
3824 }
3825
3826 done:
3827 if (sockfd >= 0)
3828 {
3829 close(sockfd);
3830 }
3831 }
3832
3833 #undef max
3834
3835 #else /* if defined(_WIN32) */
3836
3837 /*
3838 * This is a platform-specific method that returns data about
3839 * the current default gateway. Return data is placed into
3840 * a struct route_gateway_info object provided by caller. The
3841 * implementation should CLEAR the structure before adding
3842 * data to it.
3843 *
3844 * Data returned includes:
3845 * 1. default gateway address (rgi->gateway.addr)
3846 * 2. netmask of interface that owns default gateway
3847 * (rgi->gateway.netmask)
3848 * 3. hardware address (i.e. MAC address) of interface that owns
3849 * default gateway (rgi->hwaddr)
3850 * 4. interface name (or adapter index on Windows) that owns default
3851 * gateway (rgi->iface or rgi->adapter_index)
3852 * 5. an array of additional address/netmask pairs defined by
3853 * interface that owns default gateway (rgi->addrs with length
3854 * given in rgi->n_addrs)
3855 *
3856 * The flags RGI_x_DEFINED may be used to indicate which of the data
3857 * members were successfully returned (set in rgi->flags). All of
3858 * the data members are optional, however certain OpenVPN functionality
3859 * may be disabled by missing items.
3860 */
3861 void
get_default_gateway(struct route_gateway_info * rgi,openvpn_net_ctx_t * ctx)3862 get_default_gateway(struct route_gateway_info *rgi, openvpn_net_ctx_t *ctx)
3863 {
3864 CLEAR(*rgi);
3865 }
3866 void
get_default_gateway_ipv6(struct route_ipv6_gateway_info * rgi6,const struct in6_addr * dest,openvpn_net_ctx_t * ctx)3867 get_default_gateway_ipv6(struct route_ipv6_gateway_info *rgi6,
3868 const struct in6_addr *dest, openvpn_net_ctx_t *ctx)
3869 {
3870 msg(D_ROUTE, "no support for get_default_gateway_ipv6() on this system");
3871 CLEAR(*rgi6);
3872 }
3873
3874 #endif /* if defined(_WIN32) */
3875
3876 bool
netmask_to_netbits(const in_addr_t network,const in_addr_t netmask,int * netbits)3877 netmask_to_netbits(const in_addr_t network, const in_addr_t netmask, int *netbits)
3878 {
3879 int i;
3880 const int addrlen = sizeof(in_addr_t) * 8;
3881
3882 if ((network & netmask) == network)
3883 {
3884 for (i = 0; i <= addrlen; ++i)
3885 {
3886 in_addr_t mask = netbits_to_netmask(i);
3887 if (mask == netmask)
3888 {
3889 if (i == addrlen)
3890 {
3891 *netbits = -1;
3892 }
3893 else
3894 {
3895 *netbits = i;
3896 }
3897 return true;
3898 }
3899 }
3900 }
3901 return false;
3902 }
3903
3904 /* similar to netmask_to_netbits(), but don't mess with base address
3905 * etc., just convert to netbits - non-mappable masks are returned as "-1"
3906 */
3907 int
netmask_to_netbits2(in_addr_t netmask)3908 netmask_to_netbits2(in_addr_t netmask)
3909 {
3910 int i;
3911 const int addrlen = sizeof(in_addr_t) * 8;
3912
3913 for (i = 0; i <= addrlen; ++i)
3914 {
3915 in_addr_t mask = netbits_to_netmask(i);
3916 if (mask == netmask)
3917 {
3918 return i;
3919 }
3920 }
3921 return -1;
3922 }
3923
3924
3925 /*
3926 * get_bypass_addresses() is used by the redirect-gateway bypass-x
3927 * functions to build a route bypass to selected DHCP/DNS servers,
3928 * so that outgoing packets to these servers don't end up in the tunnel.
3929 */
3930
3931 #if defined(_WIN32)
3932
3933 static void
add_host_route_if_nonlocal(struct route_bypass * rb,const in_addr_t addr)3934 add_host_route_if_nonlocal(struct route_bypass *rb, const in_addr_t addr)
3935 {
3936 if (test_local_addr(addr, NULL) == TLA_NONLOCAL && addr != 0 && addr != IPV4_NETMASK_HOST)
3937 {
3938 add_bypass_address(rb, addr);
3939 }
3940 }
3941
3942 static void
add_host_route_array(struct route_bypass * rb,const IP_ADDR_STRING * iplist)3943 add_host_route_array(struct route_bypass *rb, const IP_ADDR_STRING *iplist)
3944 {
3945 while (iplist)
3946 {
3947 bool succeed = false;
3948 const in_addr_t ip = getaddr(GETADDR_HOST_ORDER, iplist->IpAddress.String, 0, &succeed, NULL);
3949 if (succeed)
3950 {
3951 add_host_route_if_nonlocal(rb, ip);
3952 }
3953 iplist = iplist->Next;
3954 }
3955 }
3956
3957 static void
get_bypass_addresses(struct route_bypass * rb,const unsigned int flags)3958 get_bypass_addresses(struct route_bypass *rb, const unsigned int flags)
3959 {
3960 struct gc_arena gc = gc_new();
3961 /*bool ret_bool = false;*/
3962
3963 /* get full routing table */
3964 const MIB_IPFORWARDTABLE *routes = get_windows_routing_table(&gc);
3965
3966 /* get the route which represents the default gateway */
3967 const MIB_IPFORWARDROW *row = get_default_gateway_row(routes);
3968
3969 if (row)
3970 {
3971 /* get the adapter which the default gateway is associated with */
3972 const IP_ADAPTER_INFO *dgi = get_adapter_info(row->dwForwardIfIndex, &gc);
3973
3974 /* get extra adapter info, such as DNS addresses */
3975 const IP_PER_ADAPTER_INFO *pai = get_per_adapter_info(row->dwForwardIfIndex, &gc);
3976
3977 /* Bypass DHCP server address */
3978 if ((flags & RG_BYPASS_DHCP) && dgi && dgi->DhcpEnabled)
3979 {
3980 add_host_route_array(rb, &dgi->DhcpServer);
3981 }
3982
3983 /* Bypass DNS server addresses */
3984 if ((flags & RG_BYPASS_DNS) && pai)
3985 {
3986 add_host_route_array(rb, &pai->DnsServerList);
3987 }
3988 }
3989
3990 gc_free(&gc);
3991 }
3992
3993 #else /* if defined(_WIN32) */
3994
3995 static void
get_bypass_addresses(struct route_bypass * rb,const unsigned int flags)3996 get_bypass_addresses(struct route_bypass *rb, const unsigned int flags) /* PLATFORM-SPECIFIC */
3997 {
3998 }
3999
4000 #endif /* if defined(_WIN32) */
4001
4002 /*
4003 * Test if addr is reachable via a local interface (return ILA_LOCAL),
4004 * or if it needs to be routed via the default gateway (return
4005 * ILA_NONLOCAL). If the target platform doesn't implement this
4006 * function, return ILA_NOT_IMPLEMENTED.
4007 *
4008 * Used by redirect-gateway autolocal feature
4009 */
4010
4011 #if defined(_WIN32)
4012
4013 int
test_local_addr(const in_addr_t addr,const struct route_gateway_info * rgi)4014 test_local_addr(const in_addr_t addr, const struct route_gateway_info *rgi)
4015 {
4016 struct gc_arena gc = gc_new();
4017 const in_addr_t nonlocal_netmask = 0x80000000L; /* routes with netmask <= to this are considered non-local */
4018 int ret = TLA_NONLOCAL;
4019
4020 /* get full routing table */
4021 const MIB_IPFORWARDTABLE *rt = get_windows_routing_table(&gc);
4022 if (rt)
4023 {
4024 for (DWORD i = 0; i < rt->dwNumEntries; ++i)
4025 {
4026 const MIB_IPFORWARDROW *row = &rt->table[i];
4027 const in_addr_t net = ntohl(row->dwForwardDest);
4028 const in_addr_t mask = ntohl(row->dwForwardMask);
4029 if (mask > nonlocal_netmask && (addr & mask) == net)
4030 {
4031 ret = TLA_LOCAL;
4032 break;
4033 }
4034 }
4035 }
4036
4037 gc_free(&gc);
4038 return ret;
4039 }
4040
4041 #else /* if defined(_WIN32) */
4042
4043 int
test_local_addr(const in_addr_t addr,const struct route_gateway_info * rgi)4044 test_local_addr(const in_addr_t addr, const struct route_gateway_info *rgi) /* PLATFORM-SPECIFIC */
4045 {
4046 if (rgi)
4047 {
4048 if (local_route(addr, 0xFFFFFFFF, rgi->gateway.addr, rgi))
4049 {
4050 return TLA_LOCAL;
4051 }
4052 else
4053 {
4054 return TLA_NONLOCAL;
4055 }
4056 }
4057 return TLA_NOT_IMPLEMENTED;
4058 }
4059
4060 #endif /* if defined(_WIN32) */
4061